review refactor: Remove replace methods which were using CtElement#replace

[surli]

Fix #1385

[spoon-bot]

Detected changes by Revapi: 9.

Old API: fr.inria.gforge.spoon:spoon-core:jar:6.0.0-20171108.100023-153

New API: fr.inria.gforge.spoon:spoon-core:jar:6.0.0-SNAPSHOT

Name	Change 1
Old	method CtBlock::replace(CtBlock)
New	none
Code	java.method.removed
Description	Method was removed.
Breaking	binary: breaking

Name	Change 2
Old	method CtExpression::replace(CtExpression)
New	none
Code	java.method.removed
Description	Method was removed.
Breaking	binary: breaking

Name	Change 3
Old	method CtStatement::replace(CtStatement)
New	none
Code	java.method.removed
Description	Method was removed.
Breaking	binary: breaking

Name	Change 4
Old	method CtField::replace(CtField)
New	none
Code	java.method.removed
Description	Method was removed.
Breaking	binary: breaking

Name	Change 5
Old	method CtMethod::replace(CtMethod)
New	none
Code	java.method.removed
Description	Method was removed.
Breaking	binary: breaking

Name	Change 6
Old	method CtExecutableReference::replace(CtExecutableReference)
New	none
Code	java.method.removed
Description	Method was removed.
Breaking	binary: breaking

Name	Change 7
Old	method CtPackageReference::replace(CtPackageReference)
New	none
Code	java.method.removed
Description	Method was removed.
Breaking	binary: breaking

Name	Change 8
Old	method CtTypeReference::replace(CtTypeReference)
New	none
Code	java.method.removed
Description	Method was removed.
Breaking	binary: breaking

Name	Change 9
Old	method CtVariableReference::replace(CtVariableReference)
New	none
Code	java.method.removed
Description	Method was removed.
Breaking	binary: breaking

[monperrus]

OK for me. I don't think it will break any code.