Added Json export and import

As requested, It will now save and load json maps and can export a png of the map. 

The Fileinout extension broke, so i removed it in this version, which means it will only save in game makers allowed sandbox areas unless you're running the project in the editor. So I added the project file too. I tried to update the game example project's scrSave and scrLoad scripts which should work, but i didn't have time to test. This new project is for GMS2.

Hope someone finds this useful!

-Dev Reign