vim: Add quickfix window statusline

Closes #419
Update tests
Merge branch 'feature/vim-special-windows' into develop
Update Arch Linux optdepends and conflicts
Merge branch 'fix-archlinux-packages' into develop
vim: Fix missing qf buffer highlighting
Merge branch 'fix-quickfix-buffer-highlighting' into develop
Merge remote-tracking branch 'origin/develop' into tuxdude-dev