Blender Git Loki

To end the issues with AA (International) Fonts; the .bfont.tff now is
compiled in (datatoc) and doesn't need installation anymore.

Also reviewed weird path conventions for searching AA fonts;

- U.fontdir is only used as standard search path for fileselecting
- U.fontname stores only full path to AA font if used one
- If a font cannot be found, it always falls back to the compiled in one
- If .B.blend is saved with default font, U.fontname is not set

Also added a button in usermenu "restore default".

When this works as expected, I'll commit changes for installation too.