balsamiqmockups: Update to latest version and change maintainer

- Quote use of srcdir and pkgdir
mma: Missing comment for github
balsamiqmockups: New desktop integration

- Patch the upstream package to prevent AIR from overwriting our mime
info with incorrect info
- Remove the icons from the AIR meta fileType because this dirties up
the users local config for no good reason
- Add IANA mime-type entry