Mirror dropped items if corpse is mirrored
Reduce translucency of blue and green blood

This makes them more consistent with red blood.
Fix texture offset of linedef 47 in MAP01 TNT.WAD
Revamped gamma correction

There's now 31 gamma correction levels in increments of 0.05 between 0.5
and 2.0 inclusive. Gamma correction level 0.75 is still the default.
Setting in default.cfg is now the float "gammalevel" instead of
"usegamma".
Remove double trailing zeros from gamma message
Save gamma correction level the moment it changes
Allow autorepeat of F11 key...

...now that's a larger amount of gamma correction levels.
First press of F11 key shows current gamma level

Subsequent presses of the F11 key (or SHIFT+F11) before the message
disappears (in 4 seconds) will change the gamma correction level.
Initial prep to create 64-bit binaries
More code changes for 64-bit binary

After these changes, I can get the 64-bit binary to compile, but it
crashes. Using the 64-bit versions of SDL.dll and SDL_mixer.dll, but I
must be missing something. There are several 'size_t' to 'int' warnings.
Optimizations to the spawning of blood
Fix gamma correction levels not cycling properly
Check platform toolset for XInput version to use
Another minor fix to gamma correction level code
Make no sound on initial press of F11 key
Increase gamma on 1st press if msg won't be seen
Display "GAMMA CORRECTION OFF" at level 1.0
Display "ExMy"/"MAPxy" in IDCLEV cheat message
Show if toggled "ON"/"OFF" in IDBEHOLDx cheat msg
Fix IDBEHOLDS cheat not toggling berserk off