Get ready for the Virtual Universe Code

- Update prebuild.xml
- Update .gitattributes
- Update .gitignore
- Update Build From Source.txt
- Update release-updates.xml
- Update snapshot-updates.xml
- Update runprebuild.bat
- Update runprebuild.sh
- Update runprebuild.command
- Update tc-autobuild.bat
- Update tc-autobuild.sh