feature: SpoonModelTree can be created with custom root element

[pvojtechovsky]

new constructor SpoonModelTree(CtElement rootElement) allows to visualize spoon model of subtree.

[spoon-bot]

Detected changes by Revapi: 39.

Old API: fr.inria.gforge.spoon:spoon-core:jar:6.2.0-20180101.160601-18

New API: fr.inria.gforge.spoon:spoon-core:jar:6.2.0-SNAPSHOT

Name	Change 1
Old	class NameFilter
New	class NameFilter
Code	java.class.noLongerImplementsInterface
Description	Class no longer implements interface 'java.util.function.Predicate'.
Breaking	binary: breaking

Name	Change 2
Old	interface Filter
New	interface Filter
Code	java.class.noLongerImplementsInterface
Description	Class no longer implements interface 'java.util.function.Predicate'.
Breaking	binary: breaking

Name	Change 3
Old	class AbstractFilter
New	class AbstractFilter
Code	java.class.noLongerImplementsInterface
Description	Class no longer implements interface 'java.util.function.Predicate'.
Breaking	binary: breaking

Name	Change 4
Old	class AbstractReferenceFilter
New	class AbstractReferenceFilter
Code	java.class.noLongerImplementsInterface
Description	Class no longer implements interface 'java.util.function.Predicate'.
Breaking	binary: breaking
Name	Change 4
:---:	:---:
Old	class AbstractReferenceFilter
New	class AbstractReferenceFilter
Code	java.class.noLongerImplementsInterface
Description	Class no longer implements interface 'java.util.function.Predicate'.
Breaking	binary: breaking

Name	Change 5
Old	class AnnotationFilter
New	class AnnotationFilter
Code	java.class.noLongerImplementsInterface
Description	Class no longer implements interface 'java.util.function.Predicate'.
Breaking	binary: breaking

Name	Change 6
Old	class CompositeFilter
New	class CompositeFilter
Code	java.class.noLongerImplementsInterface
Description	Class no longer implements interface 'java.util.function.Predicate'.
Breaking	binary: breaking

Name	Change 7
Old	class DirectReferenceFilter
New	class DirectReferenceFilter
Code	java.class.noLongerImplementsInterface
Description	Class no longer implements interface 'java.util.function.Predicate'.
Breaking	binary: breaking

Name	Change 8
Old	class ExecutableReferenceFilter
New	class ExecutableReferenceFilter
Code	java.class.noLongerImplementsInterface
Description	Class no longer implements interface 'java.util.function.Predicate<spoon.reflect.reference.CtExecutableReference<?>>'.
Breaking	binary: breaking

Name	Change 9
Old	class FieldAccessFilter
New	class FieldAccessFilter
Code	java.class.noLongerImplementsInterface
Description	Class no longer implements interface 'java.util.function.Predicate<spoon.reflect.code.CtFieldAccess<?>>'.
Breaking	binary: breaking

Name	Change 10
Old	class InvocationFilter
New	class InvocationFilter
Code	java.class.noLongerImplementsInterface
Description	Class no longer implements interface 'java.util.function.Predicate<spoon.reflect.code.CtInvocation<?>>'.
Breaking	binary: breaking

Name	Change 11
Old	class LambdaFilter
New	class LambdaFilter
Code	java.class.noLongerImplementsInterface
Description	Class no longer implements interface 'java.util.function.Predicate<spoon.reflect.code.CtLambda<?>>'.
Breaking	binary: breaking

Name	Change 12
Old	class LineFilter
New	class LineFilter
Code	java.class.noLongerImplementsInterface
Description	Class no longer implements interface 'java.util.function.Predicate<spoon.reflect.code.CtStatement>'.
Breaking	binary: breaking

Name	Change 13
Old	class NamedElementFilter
New	class NamedElementFilter
Code	java.class.noLongerImplementsInterface
Description	Class no longer implements interface 'java.util.function.Predicate'.
Breaking	binary: breaking

Name	Change 14
Old	class OverriddenMethodFilter
New	class OverriddenMethodFilter
Code	java.class.noLongerImplementsInterface
Description	Class no longer implements interface 'java.util.function.Predicate<spoon.reflect.declaration.CtMethod<?>>'.
Breaking	binary: breaking

Name	Change 15
Old	class OverridingMethodFilter
New	class OverridingMethodFilter
Code	java.class.noLongerImplementsInterface
Description	Class no longer implements interface 'java.util.function.Predicate<spoon.reflect.declaration.CtMethod<?>>'.
Breaking	binary: breaking

Name	Change 16
Old	class ReferenceTypeFilter
New	class ReferenceTypeFilter
Code	java.class.noLongerImplementsInterface
Description	Class no longer implements interface 'java.util.function.Predicate'.
Breaking	binary: breaking

Name	Change 17
Old	class RegexFilter
New	class RegexFilter
Code	java.class.noLongerImplementsInterface
Description	Class no longer implements interface 'java.util.function.Predicate'.
Breaking	binary: breaking

Name	Change 18
Old	class ReturnOrThrowFilter
New	class ReturnOrThrowFilter
Code	java.class.noLongerImplementsInterface
Description	Class no longer implements interface 'java.util.function.Predicate<spoon.reflect.code.CtCFlowBreak>'.
Breaking	binary: breaking

Name	Change 19
Old	class SubtypeFilter
New	class SubtypeFilter
Code	java.class.noLongerImplementsInterface
Description	Class no longer implements interface 'java.util.function.Predicate<spoon.reflect.declaration.CtType<?>>'.
Breaking	binary: breaking

Name	Change 20
Old	class TypeFilter
New	class TypeFilter
Code	java.class.noLongerImplementsInterface
Description	Class no longer implements interface 'java.util.function.Predicate'.
Breaking	binary: breaking

Name	Change 21
Old	class VariableAccessFilter
New	class VariableAccessFilter
Code	java.class.noLongerImplementsInterface
Description	Class no longer implements interface 'java.util.function.Predicate<T extends spoon.reflect.code.CtVariableAccess<?>>'.
Breaking	binary: breaking

Name	Change 22
Old	class TemplateMatcher
New	class TemplateMatcher
Code	java.class.noLongerImplementsInterface
Description	Class no longer implements interface 'java.util.function.Predicate<spoon.reflect.declaration.CtElement>'.
Breaking	binary: breaking

Name	Change 23
Old	method Predicate::and(Predicate)
New	none
Code	java.method.removed
Description	Method was removed.
Breaking	binary: breaking

Name	Change 24
Old	method DefaultJavaPrettyPrinter::getPrinterTokenWriter()
New	none
Code	java.method.removed
Description	Method was removed.
Breaking	binary: breaking

Name	Change 25
Old	method Predicate::isEqual(Object)
New	none
Code	java.method.removed
Description	Method was removed.
Breaking	binary: breaking

Name	Change 26
Old	method Predicate::negate()
New	none
Code	java.method.removed
Description	Method was removed.
Breaking	binary: breaking

Name	Change 27
Old	method Predicate::or(Predicate)
New	none
Code	java.method.removed
Description	Method was removed.
Breaking	binary: breaking

Name	Change 28
Old	method Filter::test(Filter.T)
New	none
Code	java.method.removed
Description	Method was removed.
Breaking	binary: breaking

Name	Change 29
Old	method Filter::test(Filter.T)
New	none
Code	java.method.removed
Description	Method was removed.
Breaking	binary: breaking

Name	Change 30
Old	method Filter::test(Filter.T)
New	none
Code	java.method.removed
Description	Method was removed.
Breaking	binary: breaking

Name	Change 31
Old	method Filter::test(Filter.T)
New	none
Code	java.method.removed
Description	Method was removed.
Breaking	binary: breaking

Name	Change 32
Old	method Filter::test(Filter.T)
New	none
Code	java.method.removed
Description	Method was removed.
Breaking	binary: breaking

Name	Change 33
Old	method Filter::test(Filter.T)
New	none
Code	java.method.removed
Description	Method was removed.
Breaking	binary: breaking

Name	Change 34
Old	method Filter::test(Filter.T)
New	none
Code	java.method.removed
Description	Method was removed.
Breaking	binary: breaking

Name	Change 35
Old	method Filter::test(Filter.T)
New	none
Code	java.method.removed
Description	Method was removed.
Breaking	binary: breaking

Name	Change 36
Old	method Filter::test(Filter.T)
New	none
Code	java.method.removed
Description	Method was removed.
Breaking	binary: breaking

Name	Change 37
Old	method Filter::test(Filter.T)
New	none
Code	java.method.removed
Description	Method was removed.
Breaking	binary: breaking

Name	Change 38
Old	method Filter::test(Filter.T)
New	none
Code	java.method.removed
Description	Method was removed.
Breaking	binary: breaking

Name	Change 39
Old	method Filter::test(Filter.T)
New	none
Code	java.method.removed
Description	Method was removed.
Breaking	binary: breaking

[pvojtechovsky]

Revapi seems to be confused ... this PR really did not changed anything on Filter