MI's unimportant code cleanup
Just removing a bunch of unused variables/function prototypes from the source code and similarly minor stuff, nothing here should change gameplay much (if at all).
See merge request !71
Updated the mid-game gametype/level select menu! Just need to combine it with the server creation menu, and then I'll be ready to make a merge request...
* Added the ability to read in mobjtypes as well as from a short list of flicky constants.
* Added a new state, S_XPLD_FLICKY, which is the new deathstate of all badniks.
* Put the disabled animal-spawn-on-P_KillMobj behind a #define.
* Renamed the branch and associated properties to something not rife with sin.
No idea if this compiles yet (let alone if what is there works at all), just getting this out the way so I can work on certain other things *cough plane displacement cough*
Use whatever names you want for your music. So long as you prefix the lumps with O_ or D_, it doesn't matter anymore.
DISCLAIMER: Linedef type 413 (change music) and Lua scripting is not tested.
(cherry picked from commit 025ca413a2)
# Conflicts:
# src/p_user.c
