Fix PlayerCmd not handling angle and aiming correctly

See merge request !1265

Split dehacked.c into multiple files.

See merge request STJr/SRB2!1222

Some fixes for spritestuff2

See merge request STJr/SRB2!1264

Fix a dumb typo of luaL_checklstring i made whoops

See merge request !1266

Make several Lua global variables writable.

See merge request STJr/SRB2!1233

Improved sprite sorting against 3d floors

See merge request !1235

Can't use gz/gzt because there is no transformation to make those work
differently for splats.

Flame Shield & Thunder Shield Adjustment (Closes #363)

Closes #363

See merge request !1220

Made height/spinheight and height change values in replays more accurate

See merge request !1241

Make the replay camera follow the player

See merge request STJr/SRB2!1243

Remove unused music type enums

See merge request !1253

Uncap palette lump palettes & allow flashpal palettes to display during pause

See merge request !1255

Echo filenames when compiling without ECHO=1

See merge request !1260

New sprite features

See merge request !1257

Update R_DrawFloorSprite_NPO2_8 and R_DrawTranslucentFloorSprite_NPO2_8 to have the lastest NPO2 optimizations

Use SDL version of executable icon at runtime on macOS

See merge request !1250

UDMF: Multitag support

See merge request !1097

Expose more music functions to Lua

See merge request !1230