What changed in EDuke32, build by build

Fix `includeoptional` in Mapster32's sound parser

Implement `includeoptional` in Mapster32's CON parsing

Add "includeoptional" CON token, that doesn't error out if the included file is absent.

Don't try to interpolate rotatesprite calls if the clock difference is negative.

Blackhole any accumulated input when clearing the input FIFO/starting a level, prevents you from being spun around the wrong way when you spawn in.

Add missing GAMEVAR_RAWQ16PTR case in VM_GAMEVAR_OPERATOR

EVENT_PRE/POSTWEAPONSHOOT: Set ud.return[0]/userdef.return 1 to the number of the current shot we're processing in a burst

Make some actors work properly with TROR

Give EVENT_POSTWEAPONSHOOT the return value of A_Shoot.

Port EVENT_PREWEAPONSHOOT and EVENT_POSTWEAPONSHOOT from NetDuke32.

Add warning when `terminate` found outside state or event

Add prependstate and appendstate

Fix weapon behavior with FIREDELAY set to 1

Fix rapid-tap chaingun glitch

Move alpha==255 check up in dorotatesprite.

Fix ordering issues with rotatesprite interpolation that were causing insane jitter and pacing issues.

add a few rotatesprite flags for fine control of interpolation.

Apply TerminX's rotatesprite interpolation fix. (Fixes interp jitter when framerate is over 120fps)

Add wall cstat mask parameter to cansee, and add optional param at the end of CON_CANSEE for it.

Interpolate FIRELASER trails.

When loading new art files, blanks no longer erase existing tiles, allowing "inserting" new tiles, or essentially stacking them.

Add parameter to mdgetskinmap enabling fallback to other skins if one for the current pal isn't found.

Fix regression causing KV6 voxels to render black.

Get forcefilter working with models when sampler objects are enabled. Factored out some related code duplication.