Gold linker, CCache, Stats, LGTM

- Increases linker performance under Linux builds by using Gold linker, if available
- ccache is used if available
- removed statistic class (Stats.cpp) from project due to the missing result (sorry @Brindosch)
- add LGTM bandges for code analysis overview

Signed-off-by: Paulchen-Panther <Paulchen-Panter@protonmail.com>

libsrc/hyperion/GrabberWrapper.cpp

@@ -32,7 +32,7 @@ GrabberWrapper::GrabberWrapper(QString grabberName, Grabber * ggrabber, unsigned
 
 GrabberWrapper::~GrabberWrapper()
 {
-	stop();
+	GrabberWrapper::stop(); // TODO Is this right????????
 	Debug(_log,"Close grabber: %s", QSTRING_CSTR(_grabberName));
 }