added AUTHORS to packages

required for the new Credits button
add the global mix database from XCC

required for the asset browser
fix typo in spec file
don't break if FILES contain spaces
don't list every file in RPM spec %files

folders are enough
forgot to add AUTHORS and global mix database.dat to NSIS script
Merge pull request #3494 from Mailaender/fix-packaging

Packaged files missing from playtest-20130629