Allow to use constants in preload/load
Created by: kubecz3k
Currently it's impossible to write code like that:
const PATH_2_SCENE = "ScenePath.xscn";
var scene = preload(PATH_2_SCENE);
In editor validation (before starting the program) It says "error(9,22): Expected string constant as 'preload' argument"
It would be nice to allow developers to use static const variables in case together with preloads and loads since it would ease changes if there would be ability to define paths in one place for the whole project.