Add thread controlling functions for modules

app/PlaYUVerAppModuleIf.h

@@ -98,6 +98,7 @@ public:
   UInt getModuleRequirements() { return m_pcModule->m_uiModuleRequirements; }
   Void update();
   Bool apply( Bool isPlaying = false, Bool disableThreads = false );
+  Bool isRunning();
   Void show();
   Void destroy();