Add firewall config to packages

This adds the firewall configuration for most, if not all packages that need it. Closes #145.

Took the used ports from the wiki page. Any packages not in the wiki are not added here, so I might be missing some of the last added packages.

Note: For now, I have not added optional (SSL) ports that are configurable from within packages, although technically, it's possible with a second section in the .sc file.

Anyone in for a sanity check before it's merged? I think I lost mine ;)