test SQ7.7

[guwirth]

• add SQ 7.7 for testing
• remove CoreMetrics.FILES metric, plugin no more allowed to set it
• remove Directories metric, no more supported by SQ
• file extensions must be unique assigned to a plugin: resolve .h conflict with c and cxx plugin
• remove folders with XML files from analysis: plugin handling XML files is part of SQ 7.7 now

ERROR: Language of file 'PathHandling/PathHandle.h' can not be decided as the file matches patterns of both sonar.lang.patterns.c++ : **/*.cxx,**/*.cpp,**/*.cc,**/*.c,**/*.hxx,**/*.hpp,**/*.hh,**/*.h and sonar.lang.patterns.c : **/*.c,**/*.h
make file extension unique: ERROR: Language of file 'tests/unittests/stdafx.h' can not be decided as the file matches patterns of both sonar.lang.patterns.c++ : **/*.cxx,**/*.cpp,**/*.cc,**/*.c,**/*.hxx,**/*.hpp,**/*.hh,**/*.h and sonar.lang.patterns.c : **/*.c,**/*.h

This change is 

[guwirth]

16:18:08.133 ERROR: Error during SonarQube Scanner execution
java.lang.UnsupportedOperationException: Metric 'files' should not be computed by a Sensor
	at org.sonar.scanner.sensor.DefaultSensorStorage.saveMeasure(DefaultSensorStorage.java:168)
	at org.sonar.scanner.sensor.DefaultSensorStorage.store(DefaultSensorStorage.java:132)
	at org.sonar.api.batch.sensor.measure.internal.DefaultMeasure.doSave(DefaultMeasure.java:95)
	at org.sonar.api.batch.sensor.internal.DefaultStorable.save(DefaultStorable.java:45)
	at org.sonar.cxx.sensors.squid.CxxSquidSensor.saveMeasures(CxxSquidSensor.java:239)
	at org.sonar.cxx.sensors.squid.CxxSquidSensor.save(CxxSquidSensor.java:224)
	at org.sonar.cxx.sensors.squid.CxxSquidSensor.execute(CxxSquidSensor.java:160)
	at org.sonar.scanner.sensor.AbstractSensorWrapper.analyse(AbstractSensorWrapper.java:48)
	at org.sonar.scanner.sensor.ModuleSensorsExecutor.execute(ModuleSensorsExecutor.java:85)
	at org.sonar.scanner.sensor.ModuleSensorsExecutor.lambda$execute$1(ModuleSensorsExecutor.java:59)
	at org.sonar.scanner.sensor.ModuleSensorsExecutor.withModuleStrategy(ModuleSensorsExecutor.java:77)
	at org.sonar.scanner.sensor.ModuleSensorsExecutor.execute(ModuleSensorsExecutor.java:59)
	at org.sonar.scanner.scan.ModuleScanContainer.doAfterStart(ModuleScanContainer.java:82)
	at org.sonar.core.platform.ComponentContainer.startComponents(ComponentContainer.java:136)
	at org.sonar.core.platform.ComponentContainer.execute(ComponentContainer.java:122)
	at org.sonar.scanner.scan.ProjectScanContainer.scan(ProjectScanContainer.java:359)
	at org.sonar.scanner.scan.ProjectScanContainer.scanRecursively(ProjectScanContainer.java:354)
	at org.sonar.scanner.scan.ProjectScanContainer.doAfterStart(ProjectScanContainer.java:317)
	at org.sonar.core.platform.ComponentContainer.startComponents(ComponentContainer.java:136)
	at org.sonar.core.platform.ComponentContainer.execute(ComponentContainer.java:122)
	at org.sonar.scanner.bootstrap.GlobalContainer.doAfterStart(GlobalContainer.java:128)
	at org.sonar.core.platform.ComponentContainer.startComponents(ComponentContainer.java:136)
	at org.sonar.core.platform.ComponentContainer.execute(ComponentContainer.java:122)
	at org.sonar.batch.bootstrapper.Batch.doExecute(Batch.java:73)
	at org.sonar.batch.bootstrapper.Batch.execute(Batch.java:67)
	at org.sonarsource.scanner.api.internal.batch.BatchIsolatedLauncher.execute(BatchIsolatedLauncher.java:46)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.sonarsource.scanner.api.internal.IsolatedLauncherProxy.invoke(IsolatedLauncherProxy.java:60)
	at com.sun.proxy.$Proxy0.execute(Unknown Source)
	at org.sonarsource.scanner.api.EmbeddedScanner.doExecute(EmbeddedScanner.java:185)
	at org.sonarsource.scanner.api.EmbeddedScanner.execute(EmbeddedScanner.java:137)
	at org.sonarsource.scanner.cli.Main.execute(Main.java:111)
	at org.sonarsource.scanner.cli.Main.execute(Main.java:75)
	at org.sonarsource.scanner.cli.Main.main(Main.java:61)