[crossfire] Git for arch, maps, server, and client

[Kevin Zheng]

Hi there,

I'm pleased to announce that all of the repositories hosted on the 
Crossfire SourceForge have been migrated to Git. Starting now, all new 
commits should be made to Git. These repositories are located at:

https://sourceforge.net/p/crossfire/_list/git

The SVN is now in read-only mode and will no longer be updated.

When committing to Git, please follow our Git commit policy:

1. To preserve linear history, no merge commits in 'master'. When
   merging branches into 'master', rebase the branch against 'master'
   and then do a fast-forward from 'master'.

2. Commit messages begin with a short, one-line summary, followed by a
   blank line, followed by more detailed explanatory text, if necessary.
   Lines are wrapped to approximately 72-ish characters.

Regards,
Kevin