Add setting for ubershaders

include/renderer.hpp

@@ -74,6 +74,8 @@ class Renderer {
 	virtual std::string getUbershader() { return ""; }
 	virtual void setUbershader(const std::string& shader) {}
 
+	virtual void setUbershaderSetting(bool value) {}
+
 	// Functions for initializing the graphics context for the Qt frontend, where we don't have the convenience of SDL_Window
 #ifdef PANDA3DS_FRONTEND_QT
 	virtual void initGraphicsContext(GL::Context* context) { Helpers::panic("Tried to initialize incompatible renderer with GL context"); }