src: clazy compiler warnings

get rid of most clazy warnings (https://github.com/KDE/clazy)
* range loop use refs
* qcolor ctor with ints
* missing Q_OBJECT macro
* use .constfirst instead of .first

enabled ccache for unix systems for fasterr recompiling
* if ccache is in path we use it now

src/lib_cxx/data/parser/cxx/ASTActionFactory.cpp

@@ -26,8 +26,5 @@ clang::FrontendAction* ASTActionFactory::create()
 	{
 		return new ASTAction<clang::PreprocessOnlyAction>(m_client, m_fileRegister, m_canonicalFilePathCache);
 	}
-	else
-	{
-		return new ASTAction<clang::ASTFrontendAction>(m_client, m_fileRegister, m_canonicalFilePathCache);
-	}
+	return new ASTAction<clang::ASTFrontendAction>(m_client, m_fileRegister, m_canonicalFilePathCache);
 }