Fix some stuff I missed when rebasing `spritestuff2` to `dehacked-hell`... oops

See merge request !1286

ffloorclip fixes (resolves #385 and #391)

Closes #385 and #391

See merge request !1284

Fix a division by zero in BCZ2 Metal Sonic's routine

See merge request !1283

Fixargstr

See merge request !1280

Initialize dummy linedef tag lists

See merge request STJr/SRB2!1279

Make P_DoSuperTransformation (with giverings) only set 50 rings if you have less than 50

See merge request !1278

Send a `quitting` argument to the GameQuit Lua hook.

See merge request STJr/SRB2!1276

Disallow pk3s with extra bytes

See merge request !1275

Allow non-player objects to apply the CR_PLAYER carry type without crashing the game

See merge request !1274

Fix TC_DASHMODE not accessible to v.getColormap; add missing skin flags

See merge request STJr/SRB2!1273

Fix normal one-up sound playing in Mario mode

See merge request !1272

Allow player.lastlinehit and player.lastsidehit to be usable outside of Knuckles' climbing ability

See merge request !1271

Expose player.skin and player.availabilities to Lua as Read-only

See merge request !1269

Expose mapheader_t's selectheading option to Lua

See merge request !1268

Prevent non-CA2_SPINDASH characters from getting crushed by roll-jumping into a crevice

See merge request !1267

Fix crash when trying to use bitwise NOT on true/false/nil

See merge request !1262

Fix a Few Spin Related Bugs (Closes #286 and #360)

Closes #286 and #360

See merge request !1256

Fix emeralds,  tokens, etc not resetting when restarting marathon mode in first level

See merge request !1252

Fix reloadbans clearing ban.txt and clearbans not actually saving the changes

See merge request !1215

Move the numerical arg check below so that the string gets checked first (who decided to give them such similar names anyway).