Endgame code refactor
This is mostly just some code cleanup and moving about:
* `Y_EndGame` was moved from from y_inter.c/h to g_game.c/h, and renamed to `G_EndGame`. Frankly the old place that function lived didn't make sense, since it has nothing to do with tally screens directly.
* Most of `Y_FollowIntermission`'s code was removed, because `G_AfterIntermission` does it all already.
* And lastly, `G_ExitLevel` uses `HU_ClearCEcho()` instead of `HU_CEcho("")` to clear CEchos from the screen.
The only visible changes in-game from the above should be just that log.txt stops adding empty new lines when you complete a level, and CEchos will always be cleared after tally screens when a level goes to credits/evaluation next.
See merge request !98
-Removed code duplicity on map resource reading.
-Fixed all known PK3-related bugs so far except for the ones mentioned below.
Issues:
-Blockmap and reject matrix still aren't loaded yet when using a map WAD.
-Palettes and colormaps aren't loaded (by extension, TRANS tables might not work either).
SRB2's built-in action types will now all be pushed as META_ACTION, state_t.action can be assigned META_ACTION and return it
getUserdataType returns "action" for META_ACTION variables
SDL fixes and cleanup
Mostly cleanup tbh. I noticed a few things that bugged me when examining SDL's code recently, thought I might as well fix them up a bit.
These changes definitely does not affect netplay, so this can be merged to master just fine.
See merge request !183
Nojumpspin fix
MI can attest to this being a problem that's now solved.
To test, check out root/!LatestSRB2Files/srb2win_branch_jumpfixes.exe and root/MonsterIestyn/robohood.wad.
See merge request !95
-Now can load map WAD files inside Maps/ directory, but they must only contain map data explicitly!
Known problems:
-There's an issue causing a crash with palettes and colormaps in PK3s.
-SS_START and SS_END don't work now. Will check later.
-Standalone lumps for maps in the Maps/ folder don't work anymore; perhaps I should keep that functionality?
Notes:
-It's now a mashup of something dumb that I wanted to do and yet piling hacks again.
-A lot of code duplicity with map lump loading functions.
R_InitExtraColormaps fix
This fixes the `R_InitExtraColormaps` function so that it correctly realises there are no "extra colormaps" actually in SRB2's files, rather than telling you there are 6 extra colormaps on game startup (or however many WAD files total you have added).
For those who don't know what the function does, it searches for C_START/C_END markers, and if they exist, adds any lumps inbetween to a list of extra colormaps internally. They are never used by the game though, since we last supported colormaps of that kind so long ago I don't think anyone remembers when anymore (definitely more than a decade at least).
Merging to next since I don't know if this would cause any netplay issues or not tbh.
See merge request !182
This is just in case someone actually tries to dump in C_START/C_END and "add" colormaps using them, not that they would ever be used currently anyway.
