-Moved all the "root" input handling for GUI from individual Controls to Viewport.

-Should fix several reported bugs when controls don't have a common parent

This may have added new bugs, so please report if so!

scene/main/scene_main_loop.cpp

@@ -330,7 +330,8 @@ void SceneTree::input_text( const String& p_text ) {
 
 	root_lock++;
 
-	call_group(GROUP_CALL_REALTIME|GROUP_CALL_MULIILEVEL,"input",p_text);
+	call_group(GROUP_CALL_REALTIME,"_viewports","_vp_input_text",p_text); //special one for GUI, as controls use their own process check
+
 	root_lock--;
 
 }