Resolve issue #399 in the silliest way possible: by having Brak be yeeted off the platform by an explosion at his feet, preventing the downed mech from being anywhere near the escape pod.
* Fix off-by-one error I caused in the skin randomisation selection.
* Clean up signcolour set to never go outside of valid entry range.
* Fix the preventing-console-spam mechanism for invalid sprites viewed in-game by only setting the state's sprite/frame to S_UNKNOWN's if the object's sprite/frame is currenly equal to the state's.
* Expose this via additional upper-16-bits flags of A_FlickySpawn.
* Use this to make Snailers not spawn their flicky inside the wall they're attached to.
* Make the behaviour of Egg Capsules more consistent mechanically regarding the flicky spawning, using the above as one relevant element.
* Add "twinkling" and "landing sounds to paper signpost.
* Fix whitespace on definitions.
* It says locvar2 is unused in the comment for A_SignSpin, but it's used for the "doesn't have a spawnpoint" thing. Make it deathstate instead, so the object doesn't disappear.
* When activated, stops the timer in SP/MP.
* Applies to the mapheader countdowntimer as well.
* If you're playing Record Attack, also exits the level immediately.
* It has no special modes, no linedef flags, no parameters, nothing.
* Only not an innate property of A_BossDeath because people may want it to NOT happen sometimes, or make it happen with non-boss events too.
Also, skip over calling P_DoPlayerExit if the player isn't in game.
* Tweaked to use new sprites.
* Jet fume behaves much closer to Lach's wonderful work.
* Instead of clobbering tracer to spawn powerup overlay, use hprev.
* Change timings. One second less to charge up, but two seconds less to spin them out.
* Remove terrible pinch overlay in favour of new dashmode-mimic flashing.
I have no idea what the fuck is going on here. k infinitely ascends. (Even
above integer restrictions when I made it UINT8.) I can only imagine some kind
of fuckery in the stack. Surely this is a compiler error.
* Red and yellow Boost panels!
* Added because SUBARASHII and KIMOKAWAIII had several levels using them, and I wanted to make them look better.
* https://cdn.discordapp.com/attachments/359091121789468672/634486669202161674/srb20015.gif
* Uses the mapthingnums of Glaber's SOC resource boosters, but absolutely nothing else - not even the magnitudes.
* Apply MF_AMBUSH to force the player into a spin - even if they don't have a spin ability!
* Banpyura!
* A Crushstacean with a spring instead of a crushclaw.
* https://cdn.discordapp.com/attachments/428262628893261828/634432099306176512/srb20019.gif
* Wanted this for a while, finally added it.
* Improved springs.
* Add pw_noautobrake to disable autobrake for half a second when touching yellow horizontal springs, and a second when touching red ones, even on the ground.
* Add pw_justsprung to disable directionchar for a few tics while touching any springs with a horizontal component to their velocity.
* Add the diagonal spring flag options Red and Yellow Diagonal Springs have to the Blue Diagonal Spring as well.
* Started but decided against a tip of the hat to the CD spring spin, hidden behind #define SPRINGSPIN.
* Make directionchar "lag behind" a little bit in waterslides.
* Improved flame jets.
* They now use new sprites for having their flames move upwards and sideways, instead of having them always face downwards like in 2.1!
* Fixed a mixed declaration and code error in A_RolloutRock. (Sorry Lach!)
* Make the Amy Cameo only spawn in SP, Record Attack, or Co-op unless it's the Clone Mode.
* Improved ZB config.
* Add above new types.
* Add Blue Diagonal Spring, which existed in the source but not the config.
* Re-order enemies in ZB config by zone (but keep them in the Enemies section only).
