libgdx fonts

Use gdx-fontpack instead of Heiro for higher-quality fonts. You have to be a little careful to export the font .png with the exact same name as the .fnt file, and only use one font face and size per file, so that the libgdx skinning works with it.

(This screenshot shows multiple fonts and sizes, which I just told you not to do, if you want to use the libgdx skin system.)

It uses FreeType instead of java default font rendering, so the output is much nicer.

I'm interested in upgrading to distance field fonts as well, but it doesn't seem that the built in UI actors support custom font shaders, and I don't particularly want to muck around with them at the moment.