Increased THZ goop speed by 25%

Closes #229

See merge request STJr/SRB2Internal!367

Fix the sky on the intro cutscene not scrolling.

Closes #220

See merge request STJr/SRB2Internal!353

Headbumps and associated

Closes #242

See merge request STJr/SRB2Internal!360

Change the time NiGHTS bumpers aren't responded to to 5 tics rather than 9.

Closes #246

See merge request STJr/SRB2Internal!365

ACZ touchups

Closes #209, #208, and #158

See merge request STJr/SRB2Internal!359

Don't deplete special stage timer in water if you have water protection

See merge request STJr/SRB2Internal!364

Increased THZ goop speed by 25%, per Cobalt's script. (Hardcoding it was way more difficult than it looked, I'm rusty at my maths :V )

Springs and gas jets are exempt because all hell might break loose otherwise.

* Implement MS's temp bodge-fix for the TNT getting stuck on the player.

Fix entering an intangible FOF causing minecart derailment explosions. (Probably; I didn't get the bug to happen in the first place, but this looks like a likely culprit.)

# Conflicts:
#	src/p_enemy.c

There's code in B_RespawnBot that handles gravflip, but none in B_CheckRespawn. This commit fixes that. (Only done on this branch since bots had already been touched.)

Also, readd SF_INVERTPRECIP, which was done in a random branch last year and then lost because it was never merged. Enabled by ML_EFFECT1.

Add solidity back to MT_SALOONDOOR, to work as a backup in case MT_SALOONDOORCENTER doesn't work (which it has issues with in one location in ACZ2 for some reason, and I can't identify why).

Fully resolves #209, in any case.

* Tailsbots can't get into Minecarts.
* Tailsbots will stop trying to move around when the player gets pw_carry, which usually means some sort of big gimmick is happening and trying to move along with it would make the tailsbot look stupid.

* Make the center be the object stuff collides with, so that if the door is open people can't slip through.
* Add an MF_AMBUSH enhancement to allow non-minecart players to travel through.
* Make A_SaloonDoorSpawn more customisable. (var1 = object type, var2 = distance sides should be placed apart)

Addons menu cleanup

See merge request STJr/SRB2Internal!316

ACZ3 intro

Closes #217

See merge request STJr/SRB2Internal!346

Deep Sea Zone 3 hardcoding

Closes #185

See merge request STJr/SRB2Internal!349

Automap fixes

See merge request STJr/SRB2Internal!348

Patch fixes (Resolves #230)

Closes #230

See merge request STJr/SRB2Internal!347

Several bug fixes!

Closes #210, #192, and #189

See merge request STJr/SRB2Internal!345

Resolve "Tails AI should die when taking damage in Ultimate"

Closes #231

See merge request STJr/SRB2Internal!344

Trigonometric input capping

See merge request STJr/SRB2Internal!343

Controller hotplug support.

See merge request STJr/SRB2Internal!342

* https://cdn.discordapp.com/attachments/428262628893261828/626792815451701259/srb20006.gif
* Add fadeout instead of slapstick for Fang Clone Fighter death.
* Allow placed Fang and Metal Sonic objects to be marked as Clone Fighters always through presence of MTF_EXTRA.