Made HWR_InitMD2 and HWR_AddSpriteMD2/HWR_AddPlayerMD2 slightly less stupid...

Made HWR_InitMD2 and HWR_AddSpriteMD2/HWR_AddPlayerMD2 slightly less stupid with MD2-related searches in md2.dat: *Don't go barmy and search for a player skin called "THOK" when you already found the sprite called "THOK" beforehand! (or any other sprite prefix for that matter) *Don't make errors appear only for the last sprite/skin when it doesn't make sense to do so!!

Todo: Stop the redundancy that currently goes on with adding MD2s on game start-up (note that HWR_AddSpriteMD2/HWR_AddPlayerMD2 are run for all sprites/skins BEFORE HWR_InitMD2 is called)

git-svn-id: https://code.orospakr.ca/svn/srb2/trunk@8988 6de4a73c-47e2-0310-b8c1-93d6ecd3f8cd