I added similar checks for the other num* but it seems some MD2s break the other limits without knowing anyway ...so I've commented these checks out for now, unless we have further discussion regarding them later on
* Space sector support complete, bounds of drowning now altered slightly.
* Knuckles climb now has symmetrical slope support for both normal and reverse gravity.
* All slope-determining topheight and bottomheight code is now identical in form.
* Camera postimages now support slopes properly.
Moved the handling of P_PlayerInSpecialSector to P_PlayerAfterThink from P_PlayerThink.
* This allows the player to get hurt on sloped lava surfaces that are moving downwards.
* Also prevents the player from standing on death pits for 1 tic.
* Prevents the player moving 1 extra tic's worth of movement of pain when hit by sector.
* Thankfully, no consequences re conveyors.
* Like, the only consequences I've found have been positive. However, this DOES need to be thoroughly investigated before it can be allowed anywhere near Next itself.
(neither does P_CanRunOnWater, but I don't think it's necessary to make that check more complicated as you probably shouldn't be able to waterrun up steep surfaces anyways)
P_IsPointInSubsector fix! (Most importantly: Knuckles No Longer In Space)
Now works in GL by not relying on stuff which GL mutates! Thanks for the guidance, @MonsterIestyn! Tested in Steel_Titanium's Nightlight Ruins (in SUGOI), which had the perfect testbed for plenty of Knuckles issues AND is one of the first maps out to the public which eschews thok barriers altogether in some sections.
* Knuckles climbing on one sided lines is now super great and doesn't allow any space-climbing at all, OGL-exclusive OR renderer-independent. I was able to restore my earlier perfect-in-Software fix because now it also works fine in GL, too!
* The devmode TELEPORT command now actually prevents you from going outside maps which don't have thok barriers near where you were. (It only prevented you from going outside maps with thok barriers because the thok barriers bled outwards and failed some other conditions.)
* Camera now behaves identically between Software and GL. (Look closely at p_user.c - I didn't modify any code in that section, but the chasecam DOES call P_IsPointInSubsector...)
* Here's a biggun - OpenGL precipitation is ALSO fixed! Yup. That's right. It used P_IsPointInSubsector too, and THAT'S why it was broken for all this time. (I did have to do a few other changes beyond just flipping the ifdef, but HOLY SHIT.) Tested this in Mystic Realm's second zone, which kept rain all the way through in OGL!!
(And yes, I AM compiling with OGL on for this branch.)
See merge request !128
Also, the "teleport" devmode command can now gracefully handle coordinates specified outside maps with no/few thok barriers, which previously prevented teleport via the thok barrier bleed's sector floor and ceiling being equal.
