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

Merge branch 'vapier-master'

Merge branch 'master' of https://github.com/vapier/birdfont into vapier-master

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

Update old SVG parser in libbirdfont

Svg circles

Fuzz testing

Create a single fontconfig instance

Create fontconfig cache in a background thread

Fix windows build

Build configuration

New build scripts
The new script uses doit3 and only the python3 interpreter.
I am sorry, this will break some scripts.