Changes in nifty (and all it's batch renderers) for new approach of rendering fonts; with separate texture for each font.

Big conversion; to use multiple textures in font rendering for faster rendering: from 20-50 fps (due to big amount of sub-texture data uploading) to 1500-2000+ (by only texture-id switching) on my machine. Requires changes in jglfont to be applied, built and placed into local maven repo first in order to successfully finish the build process, since font renderer interface has been changed. Something in Gdx/JOGL batch renderers might have been accidentally broken during making necessary changes, needs extensive testing.