re-structured tree to be unzipped in sauer folder (for windows) (no executable included). Also added some needed files.

Also a little clean up in weapon.cpp
-added some sounds
-added friendlist.cfg and sounds.cfg (i've set the executable to use
this one)
-added autoexec.cfg for a gui (dont overwrite if you have one, just copy
the contents)
-added sauerbraten_aMod.bat where it points to a sauerbraten_aMod.exe in
/bin/ and /bin64/
-added sauerbraten_aMod.cbp (the only change is the compiled executable
name to sauerbraten_aMod.cbp)