Improve ambiwidth handling, readd additional_escapes

Fixes #307
Remove useless import
Merge branch '307-fix-ambiwidth' into develop
Add status_colors argument to branch segments

Closes #206
Merge remote-tracking branch 'zyx-i/branch-colors' into develop
Install fonts to OTF instead of TTF in PKGBUILDs

Fixes #320
Merge branch '320-fix-pkgbuilds' into develop