Prevent many Mobj related segfaults
Pretty huge mr, but all of those were tried and tested in the Saturn custom client
- Fix segfaults when damaging mobj with no painstate and when removing source from ShouldDamage
- Fix segfault when removing mobjs while iterating thinglist
- Fix dangling pointer in mapthing after removing mobj
- Fix a segfault when the game cant spawn a MapThing in P_SpawnMapThing
- If P_SetMobjState gets called with a player mobj use P_SetPlayerMobjState instead
- Add a few P_MobjWasRemoved checks
- Make mine explosions a little safer
- Fix rare K_RepairOrbitChain crash (thx indev c:)
Edited by toaster
