Factorized the file searching algorithm in the FS code. Sorted packaged files list...

Factorized the file searching algorithm in the FS code. Sorted packaged files list at load time to allow the use of a binary search. Overall, I think you can expect a file search time divided by a factor between 1.5 to 3 depending on your mod and packages layout. Time lost in the file search code on my P233MMX: vanilla Quake (4121 searches while loading the 1st demo): 2.7 sec -> 1.6 sec, Transfusion mod (9752 searches while loading BB1): 18.0 sec -> 7.6 sec

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@3766 d7cf8633-e32d-0410-b094-e92efae38249