Merge branch 'master' of github.com:johanmattssonm/birdfont

Merge branch '2.x' of github.com:johanmattssonm/birdfont into 2.x

More kerning pairs in GPOS extension subtable

Merge 2.14 with master

Language fix

White space fixes

Merge branch 'master' of https://github.com/johanmattssonm/birdfont into HEAD

Fix compilers warnings

Fix critical spacing bug

Add abstract table class

Fix memory leaks

Ligatures and a fix for the kerning bug

Move progress indicator to tab bar

Improved TTF generation, character width, gasp table etc.

Show progress bar while loading big font files

Fix GPOS kerning

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

Efficient parsing of the kern table

Valid coverage offset in GPOS kerning
Fixes a buf in the PairPosFormat1 subtable.

do not export path with only one point
chrome does not load the font if a path has less than 2 points

truncate kerning table and set word wrap in text areas

tab width

menu items for removing kerning classes

Remove PairPosFormat2

Kerning by classes
This implementation uses the PairPosFormat1 to store kerning values in
TTF files and has a new kerning display that allows the user to define
kerning classes.

Some code to do PairPosFormat2 is included as well but it seems like
the PairPosFormat1 is the better solution.