TH_CLEAN_3.5: push() cleanup side of things, assure SDRThread::readStream() to actually check for full + make ThreadQueue notify even in case on not-successfull push(), make it spam notify_all() everytime

src/AppFrame.cpp

@@ -1645,6 +1645,7 @@ bool AppFrame::loadSession(std::string fileName) {
     }
 
 	wxGetApp().getDemodMgr().setActiveDemodulator(nullptr, false);
+
     wxGetApp().getDemodMgr().terminateAll();
 
     try {