logic: implemented disabling of source groups

* added source group status (enabled/disabled)
* fixed bug where the removal of an indexed directory has not affected the files to clear
* added lots of const and override keywords in SourceGroupSettings

src/lib_java/project/SourceGroupJavaMaven.cpp

@@ -38,7 +38,7 @@ bool SourceGroupJavaMaven::prepareIndexing()
 	return true;
 }
 
-std::vector<FilePath> SourceGroupJavaMaven::doGetClassPath()
+std::vector<FilePath> SourceGroupJavaMaven::doGetClassPath() const
 {
 	std::vector<FilePath> classPath = SourceGroupJava::doGetClassPath();
 
@@ -65,6 +65,11 @@ std::shared_ptr<SourceGroupSettingsJava> SourceGroupJavaMaven::getSourceGroupSet
 	return m_settings;
 }
 
+std::shared_ptr<const SourceGroupSettingsJava> SourceGroupJavaMaven::getSourceGroupSettingsJava() const
+{
+	return m_settings;
+}
+
 std::vector<FilePath> SourceGroupJavaMaven::getAllSourcePaths() const
 {
 	std::vector<FilePath> sourcePaths;