* Set via a fourth digit in the upper midtexture for transparent FOFs
* For example - #2551 is additive solid, #1282 is subtractive half...
* The original method of setting the upper midtexture to #900 or 901 still works, since I'm not out to break existing maps.
* Software: Remove the horrible `else if` ladder for FOF translucency. Algorithms, baby!
* OpenGL: Move to using `HWR_GetBlendModeFlag` in more places, for more long-term extensible support for multiple blendmodes.
* Blend tables generated by the game.
* The Color Cube accessibility tool.
* Fixed another stupid typo that got in the way of FF_BLENDMASK working.
* Some minor adjustments for code cleanliness.
(side note, it's weird as hell that code we inherited from vanilla next - and i checked, it wasn't mangled in the merge - has bugs that straight up prevent it from functioning properly...)
All my work thus far on solving the drawflag/renderflag/additive/subtractive conundrum.
Outstandng problems:
* Bad additive/subtractive tables means that they appear opaque except under certain conditions.
* No support for FOFs, Polyobjects, or linedefs in OpenGL yet.
* All OpenGL support mostly done blind, may or may not function in practice.
If nothing else, the hard engineering problems are solved and it's just bug hammering...
Do not let SF_NOJUMPSPIN characters enter sectors they could not enter if standing at full height (Closes#457)
Closes#457
See merge request STJr/SRB2!1432
* None of the following things (grouped by the fact they fade/slide in) use hardcoded static numbers; they'e now attached to the titlecard ticker.
* Minimap.
* All V_HUDTRANS items. (Not add/sub) - this was previously broken entirely
* FREE PLAY
* Record Attack Input (no longer slides in at all - needs to be visible from start of play.)
* Fixed a rare case where V_SLIDEIN HUD elements would occasionally jump a step too far.
* Adjust several loading strings, and left-align their rendering.
* Don't call HU_LoadGraphics() again (startup cached ALL FONTS twice).
* Adjust when some functions are called during loading to more effectively compartmentalise sections of loading that depend on each other.
* LOADED_ISTARTUPGRAPHICS now comes after SCR_Startup, as we can explicitly guarantee the palette has been loaded after that function.
* Make sure everything closely related to configurations (gamedata, console stuff, etc) which is not directly dependent on anything else is loaded under LOADED_CONFIG - "Load settings" (formerly LOADED_MINIT).
* The `-warp` command line parameter is now checked alongside LOADED_DCHECKNETGAME.
* Don't attempt to draw the loading bar before LOADED_ISTARTUPGRAPHICS, as the palette is not loaded, which means you're wasting cycles on a white screen.
* Resolves#145.
* Increased granularity, to seperate out texture loading and sprite loading from other render structure initialisation.
* Shows small loading string in DEVELOP builds, to show where we can optimise loading times when we're polishing.
* Clean up con_refresh/startup, which got split into two variables in the merge by mistake.
