What changed in EDuke32, build by build

Fix issue with definegamefuncname and undefinegamefunc

Add error message for SDL_SetGammaRamp() failures in videoSetGamma()

Add C as a secondary binding for crouch and remove the mouse look and crosshair toggles from the default key bindings--they can still be bound manually if desired.

Fix missing/invalid palswaps and shades in automap with Polymost

Add EVENT_DISPLAYROOMSCAMERATILE

Make the gamma slider move in increments of 0.05 instead of 0.1

add wall point delete hotkey. Press shift+delete or the d key in 2d mode to delete a wall point without dragging it.

Add mutex to protect against S_Callback() being called from more than one thread at the same time

I honestly can't remember why I wrote this like this, but it's problematic so I'm changing it.

Make the time period between averaging the min and max values shown with r_showfps 2+ user configurable with r_showfpsperiod

Create new MV_CleanupVoice() function to handle most of what was in MV_StopVoice() plus the MV_CallBackFunc() functionality

Slightly revise multivoc locking logic

Fix an infinite loop in S_StopEnvSound() that could occur if the audio thread happened to finish playing a voice in between checking if g_sounds[].voices[].id > FX_Ok and calling FX_StopSound(), exacerbated by improper std::atomic usage