introduce project base dir property  to search for report path
use project reactor base dir to search for reports
not needed property
Merge branch 'feature/introduce_projectRootDir'

Conflicts:
	sonar-cxx-plugin/src/main/java/org/sonar/plugins/cxx/compiler/CxxCompilerSensor.java
	sonar-cxx-plugin/src/main/java/org/sonar/plugins/cxx/cppcheck/CxxCppCheckSensor.java
	sonar-cxx-plugin/src/main/java/org/sonar/plugins/cxx/externalrules/CxxExternalRulesSensor.java
	sonar-cxx-plugin/src/main/java/org/sonar/plugins/cxx/pclint/CxxPCLintSensor.java
	sonar-cxx-plugin/src/main/java/org/sonar/plugins/cxx/rats/CxxRatsSensor.java
	sonar-cxx-plugin/src/main/java/org/sonar/plugins/cxx/utils/CxxReportSensor.java
	sonar-cxx-plugin/src/main/java/org/sonar/plugins/cxx/valgrind/CxxValgrindSensor.java
	sonar-cxx-plugin/src/main/java/org/sonar/plugins/cxx/veraxx/CxxVeraxxSensor.java