Make V_DrawCenteredSmallThinString() a less precise wrapper for V_DrawCenteredSmallThinStringAtFixed() for new "small-thin-center" option in v.drawString()

Make V_DrawRightAlignedSmallThinString() a less precise wrapper for V_DrawRightAlignedSmallThinStringAtFixed() for new "small-thin-right" option in v.drawString()

Create V_DrawCenteredSmallThinStringAtFixed() for new "small-thin-fixed-center" option in v.drawString()

Thankfully "center" is just "right" but with the X offset divided by 2.

Create V_DrawRightAlignedSmallThinStringAtFixed() for new "small-thin-fixed-right" option in v.drawString()

You guys have no idea how long this took to code.

I removed the limitation present in "small-thin" by converting all relevant variables to fixed_t's and using FixedMul() and FixedDiv() when necessary. Who'da thunk it would actually work?

These function names are starting to become rediculous...

Note this has some major limitations to prevent squished text. It defaults to using V_MONOSPACE|V_OLDSPACING and you cannot change the size of characters. V_6WIDTHSPACE seems to act exactly the same as V_OLDSPACING too.

I was using V_GetColor in a lot of places I shouldn't have, making the game look wrong with a non-default colour profile.
Though, I left R_RainbowColormap alone.

https://cdn.discordapp.com/attachments/405336003239477249/641295998395613224/srb20042.gif

* Port MUSICDEFs from Kart.
    * Safe to modify without modifying game, so we can put it in music.dta eventually.
    * "Title", "AltTitle", "Authors" fields are self-evident.
    * "Soundtestpage" and "Soundtestcond" are used to determine which sound test unlockable can play them (set with Unlockable's variable, just like Level Select).
    * "Stoppingtime" and "BPM" both accept floats, and are used for presentation stuff on the sound test.
    * Ironically, we don't share a single field name with them. Such is the case of differing foci, though, and I expect they'll change their implementation to match (since this is necessary for a sound test).
* Change how S_AddSoundFx works to avoid iterating through all of them, and to allow cv_soundtest to only scroll through defined slots (instead of the infinite wall of thok sounds when scrolling to the left).
* Change V_DrawFixedPatch to allow scaling on two seperate axes.
    * Now called "V_DrawStretchyFixedPatch".
    * "V_DrawFixedPatch" is a macro to V_DrawStretchyFixedPatch now (same scale on both axes).
    * Available to Lua under v.drawStretched!
    * Even works in GL!
* Bugfix: Add SR_PLAYER to SOC's menutypes_list.

Stay tuned for the merge request, where I put the onus on the Music Team to finish this off...

This is a huge hack as it requires another font set, with each character's offset manually being set using SLADE.

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.

* Add missing vars highlightflags, recommendedflags, warningflags from Kart
* V_GetStringColormap() use vanilla behavior because Kart behavior glitches for us
* V_GetStringColormap() made non-static