Qt: Initial shader editor support

src/core/renderer_gl/renderer_gl.cpp

@@ -812,4 +812,7 @@ void RendererGL::deinitGraphicsContext() {
 	// All other GL objects should be invalidated automatically and be recreated by the next call to initGraphicsContext
 	// TODO: Make it so that depth and colour buffers get written back to 3DS memory
 	printf("RendererGL::DeinitGraphicsContext called\n");
-}
+}
+
+std::string RendererGL::getUbershader() { return ""; }
+void RendererGL::setUbershader(const std::string& shader) {}