Implement UnhandledExceptionFilter and revert "set intro scene background to white"

Also use g_iScreenWidth and g_iScreenHeight in RMLManager

Minecraft.Server/RmlManagerStub.cpp

@@ -17,6 +17,6 @@ bool RmlManager::Init(int viewport_width, int viewport_height)
 void RmlManager::Shutdown() {}
 void RmlManager::Update() {}
 void RmlManager::Render() {}
-void RmlManager::OnResize(int width, int height) {}
-void RmlManager::UpdateDpRatio(int, int) {}
+void RmlManager::OnResize() {}
+void RmlManager::UpdateDpRatio() {}
 void RmlManager::OnLanguageChanged() {}