P_SpawnMapThing(): Separated the giant post-Lua hook switch-case statement into its own function, and separated some of the larger cases into their own function as well

Make both NiGHTS hoop types use the same spawning code.

See merge request STJr/SRB2!560

Flats in walls

See merge request STJr/SRB2!548

Fix super theme ending early if invincibility expired

See merge request STJr/SRB2!559

Fix pflags not being properly reset when entering dust devil from top

See merge request STJr/SRB2!556

(UDMF prereq.) Map data lump interface

See merge request STJr/SRB2!535

# Conflicts:
#	src/p_setup.c

# Conflicts:
#	src/p_mobj.c

As a result, the old generic hoops now use 24 sprites instead of 32.

Better Deadzones

See merge request STJr/SRB2!541

Choose a random port as a client

See merge request STJr/SRB2!554

Don't uncurl from spin if Elemental Stomp is used

See merge request STJr/SRB2!555

This reverts commit 2a9a2c0f.

If you ever need to, you can change the client port number.

Using strcpy is stupid because we don't know how long the argument would be.
There's no need for a buffer anyway.

Fix a divide by zero crash when mindash and maxdash were the same.

See merge request STJr/SRB2!539

Let Lua toggle Team Match/CTF team scores HUD element

See merge request STJr/SRB2!544

Fix crash on mapload when removing Dragonbomber with Lua

See merge request STJr/SRB2!545

(UDMF prereq.) Spawn Z refactor

See merge request STJr/SRB2!536

Fix sector.lines in Lua

See merge request STJr/SRB2!542

Lua MainCfg vars

See merge request STJr/SRB2!543