Index and take length of tag lists like a table, 1-indexed. There are three
methods which may be used on tag lists:

list:iterate() - returns an iterator over the tags in the list
list:has(tag) - returns a boolean whether the tag is in the list
list.shares(list2) - returns whether two lists share a tag

"find" is also an alias to "has". Each method may be accessed from the global
taglist library too, e.g. taglist.iterate(list)

Tag lists may be compared with an equality operator too. This will tell you if
the two lists are composed of identical tags.

Accessible from sector.taglist, line.taglist and mapthing.taglist.

They are 1-indexed.

The global "tags" can be iterated upon for every unique tag which is set in the
level. If a tag is set on a sector/line/thing, it will be included. Taking the
length of "tags" will give you the number of these unique tags. (If a tag is
set on multiple sectors/lines/things, it will only be counted once though.)

For sectors, lines and mapthings, call the field "tagged". This function takes
one argument, which is the tag. The return value can be iterated over for all
the sectors/lines/things with that tag. The length can also be taken for the
number of such objects. If no argument is given, the global tag is default.

# Conflicts:
#	src/dehacked.c
#	src/dehacked.h

Fix PlayerCmd not handling angle and aiming correctly

See merge request STJr/SRB2!1265

Only call the Lua API for overridden actions

See merge request STJr/SRB2!1254

Split dehacked.c into multiple files.

See merge request STJr/SRB2!1222

Some fixes for spritestuff2

See merge request !1264

Fix a dumb typo of luaL_checklstring i made whoops

See merge request STJr/SRB2!1266

Make several Lua global variables writable.

See merge request STJr/SRB2!1233

Improved sprite sorting against 3d floors

See merge request STJr/SRB2!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 STJr/SRB2!1220

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

See merge request STJr/SRB2!1241

Make the replay camera follow the player

See merge request STJr/SRB2!1243

Remove unused music type enums

See merge request STJr/SRB2!1253

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

See merge request STJr/SRB2!1255

Echo filenames when compiling without ECHO=1

See merge request STJr/SRB2!1260