Change into Plugin

[sesopenko]

When working with the project it's becoming apparent that if it were a plugin it could be more powerful. A plugin gets direct access to the project to do things such as create resource files automatically with autotile bits set. Testing of the project involves switching back and forth between the app and the godot editor of another project, when it would be better suited as a custom dock.

The license will need to be changed to MIT so that it doesn't gobble up projects which use it with the GNUGPLV3 license.