Automated Xonotic Git build system

Okay, so I set up my Windows XP VM today and tried testing out the system.

There are some things I noticed:

1. Why are the changelogs/components text files using Linux endlines? I mean, this build system is meant for Windows directly -- so it should have Windows line endings. Whenever you go to save these in your text editor, just make sure you change the settings to output to Windows newlines and BAM problem solved.
   
2. It could really benefit to have extra controls, such as a compile.bat and a status.bat (./all each git status, shows all changed files of all repos) file.. - Another thing which would be useful is a diff output, so that it's not impossible to easily create patches for the game without having to know how to use the shell with branches. I will look into doing all of this myself later, so don't worry about that too much.
   
3. Some times I get an error when it's trying to begin a download from git, I can't remember it and I haven't had it in a while so i'll have to edit this post when I get it again -- All I had to do was start the update process over again, but yeah it was annoying, and surely would discourage others potentially.
   

Overall, nice work -- again i'll get back to you with improvements when I can