Fix code for loading TTF and OTF fonts

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

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

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

New freehand tool and updates to quadratic editing

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

Tie axis coordinates to 0, 45, 90 ... degrees

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

Rename text rendering directory

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

Fix warning about missing version list

Fix fontconfig issues connected to sandboxing

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

Use roboto as the default fallback font

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

White space fixes

Remove command line option for font config
Revert "Disable font config"
This reverts commit c4459522e3b140a3a68ca50af2c6a4ec95cad072.

Disable font config

Thread safety
Vala disconnects signals automatically but not in a thread safe way.
This happens when the Task object is destroyed in a background thread.

Create a single fontconfig instance

Create fontconfig cache in a background thread

Better parsing of TrueType outlines
Fixes parsing of "c with hook" in DejaVu Sans Extra Light

Speed optimizations in toolbox

Toolbox label

Use less memory for fallback font