Big commit, sorry. I broke several things trying to get other things to work...

Big commit, sorry. I broke several things trying to get other things to work and it's only now that all the code that worked yesterday works today!

*P_LookForEnemies is now side-effect-less and only provides a pointer to the found mobj
*player-jumping is dead, long live PF_STARTJUMP
*per Mystic's request, CA2_GUNSLINGER has a targeting icon. It also has a more restricted vertical aiming range.
*mobj for this is in the game as requested
*fast teetering animation flag
*general code cleanup