Package repositories and a package management app

[psychcf]

Package repositories similar to apt on debian or yum in fedora/redhat.

This will be it's own module, and take care of app, theme, translation and update management. App and theme management will be removed from the admin panel once this is done.

Packages will be installed using the existing package library.

Packages must be able to be installed, upgraded, and uninstalled.

[psychcf]

I think some way of installing themes would be cool too. Also when we're redoing the site it would be cool if it integrated with the listings on the site.