Move RGBController base destructor functionality into RGBController::Shutdown() so that update thread can be stopped before deleting the controller. Shutdown() must be called in every RGBController implementation before deleting the controller. Also some fixes to the NetworkServer to avoid deadlocking and disconnect issues

Controllers/EVGATuringGPUController/RGBController_EVGAGPUv2.cpp

@@ -129,6 +129,8 @@ RGBController_EVGAGPUv2::RGBController_EVGAGPUv2(EVGAGPUv2Controller* controller
 
 RGBController_EVGAGPUv2::~RGBController_EVGAGPUv2()
 {
+    Shutdown();
+
     delete controller;
 }