Made XFL parsing independent from NME. Update for new haxelib

Hello Joshua,

I need XFL parsing on a project, and this lib does the job perfectly. But I don't need NME (it's for a neko converter/backend).

So I made XFL parsing independent from NME, adding some conditional compilation and some constructor code for classes such as Matrix, Point, and a ColorTransform superclass for Color.

I also added a haxelib.json file since apparently you already made the lib Haxe3 compatible.

Thanks