Changes:
- Added a queryiwad_key cvar to control which key can force the IWAD selection to appear. It can be either "shift" or "control". Any other value will disable its functionality.
- Added some simple translucency map analysis for BOOM maps to more intelligently pick the value to use for TranslucentLine's second argument.
- Something MinGW users will probably like: i_crash.cpp no longer needs dbghelp.h if you compile with GCC.
- Added deprecation warnings for the DontHurtShooter, ExplosionRadius, and ExplosionDamage actor "properties." They were considered deprecated before; now this is explicitly stated when they are used. The problem with them is that they are not really properties and do not behave like other properties and cannot be inherited, because they are really just an alternate way of specifying parameters for A_Explode. (Anything that currently prints a deprecation warning will be removed completely in 2.2.0, which will be the version where custom state labels make their debut.)
- A_SkullPop() and A_FreezeDeathChunks() did not transfer the player's inventory to the new dismembered head "player."
- MeleeDamage was initialized to random values for each decorate actor if it wasn't explicitly specified.
- Friendlies would not turn to face you when you engaged them in conversation, nor would any actors reliably return to their original facing when you stopped talking to them.
- Some crashes fixed.