* Re-enable the perplayer stuff in V_DrawFadeFill - not worth having it disabled when it'll just have to be re-enabled later.
* Remove some "consistency with software" stuff in hw_draw.c that already has equivalents
* Fix not-guaranteed-to-be-set-to-zero-ness of sparklloop
* Add blackrock sparkles to good ending.
* Don't have emerald sparkles be randomised.
* Adjust credits to include Sal (credits sprites + four merged internal MRs and a bunch of public ones) and a few other known contributors, plus remove oni's name (he requested i do it a whiiile ago)
* Made the black rock animate backwards through its anim again, to match the 2.1 and earlier intro.
* Rid branch of mixed code declaration warnings.
* Other cleanup.
Also:
* SPR2_XTRA - instead of defining lumpnames in S_SKIN, those kinds of assets can just be bundled into the spriteset. Required for ending cutscene stuff, I guess, but also done for HUD life icon and character select image (aside from Sonic&Tails, still SOC'd in).
* Minor oversights in SPR2 support corrected.
* Better evaluation, featuring ending assets.
* Intro has warping-in blackrock, reusing ending assets.
* Cutscene text now supports lowercase (intro and custom).
* Disable the asset-fucking "gamma correction" I put in over two years ago when implementing colour cube. (This is the only thing I could move into another branch if you MUST, but it's basically invisble in the diff so w/e.)
* Don't blank the screen if the top left pixel of a screen-covering patch is transparent. (Checked via nonzero topdelta for first column)
Bugs:
* OPENGL ONLY: The first ~20 frames of both endings are fucked. A little help here? Might be HWR_DrawFadeFill's fault, which I just created. OR it could be in f_finale, but I doubt it, since it doesn't appear in Software.
(I'm doing this because MIT_GetMenuAtLevel appears to actually care about whether menutype is zero or not unlike the others; I don't want to break the code designed around that)
* add gamestate != GS_TIMEATTACK checks to prevent Record Attack or NiGHTS Mode losing their backgrounds
* increase bgname to 9 to include the extra NULL byte? (is this a good idea actually)
* make M_IterateMenuTree ignore menu levels without a menutype value
