Testing support for BMFont with HaxePunk/BitmapText by @bendmorris

It's still an experiment, but I would appreciate your thoughts (especially from @bendmorris) about this.

The scope is trying to integrate AngelCode format into BitmapText/Font (which has a very similar fnt format from what is already implemented).

A _very_ simple test is at https://github.com/azrafe7/HaxePunk-minitests/tree/master/TestBitmapText