Add support for FK kerning table

Fix compile time warnings

White space fixes

Add abstract table class

Fix memory leaks

Move progress indicator to tab bar

Show progress bar while loading big font files

Improved SVG parser
The SVG code has been rewritten and two separate ways of parsing SVG files
has been added. The first instruction is interpreted differently
in Inkscape and Illustrator.

Speed optimizations of TTF export code
Exporting kerning pairs is now more than a thousand times faster for big
fonts.