Rename icons.bf to icons.birdfont

Don't put overview glyphs in cache
The cache does become large and it slows down rendering.

Faster text and icon rendering

This commit makes switching tools many times faster.

White space fixes

Fix character info

Show fallback character in UCD entries

Fixes the art bug in ttf generation

Use theme colors in overview

Faster overview tab

Fix translate in SVG import

Character database icon

Ligature info in over view tab

Merge branch 'master' of gitorious.org:birdfont/birdfont

mac issues, including a more permissive license for libbirdfont

Get descriptions from the Unicode Character Database