Improve plugin state action

Add options to check for ...
 * Initial plugin start
 * Plugin restart
 * Scene collection change

src/switcher-data-structs.hpp

@@ -137,6 +137,8 @@ struct SwitcherData {
 	bool macroSceneSwitched = false;
 	bool replayBufferSaved = false;
 	bool obsIsShuttingDown = false;
+	bool firstInterval = true;
+	bool firstIntervalAfterStop = true;
 	int shutdownConditionCount = 0;
 
 	Curlhelper curl;