small shell script that accepts hedgewars git revisions as parameters and will try to find the respective mercurial revision

remove redundant check

merge FreeTexture into FreeAndNilTexture

put back the old uteams cleanup, leaks and all, to worry about post-release since my attempt to use DeleteGear was running into the fact that that procedure does way more than just delete a gear. might need an explicit cleanup routine for both to call.