Add UDMF linedef arguments and make slope specials use them

See merge request STJr/SRB2!643

Fix incorrect cast

See merge request !669

Brick Block Bustin

See merge request STJr/SRB2!666

Showconditionset

See merge request !651

Allow for 10 emblem hints on a map by poking the drawer a bit.

See merge request STJr/SRB2!650

PlayerThink Hook

See merge request STJr/SRB2!557

Add MT_FLINGNIGHTSSTAR mobj type

See merge request STJr/SRB2!663

Minor OpenGL improvements

See merge request !661

Fix snapping of extra multiplayer text. (Resolves #101)

See merge request STJr/SRB2!667

Mario brick blocks are likely to always have square sectors dividing seperate bricks, so allow them to be busted individually.

Rollout Rockonsistency

See merge request STJr/SRB2!655

Hexafaceted sprite angle support.

See merge request STJr/SRB2!652

Don't create colormap data out of sidedef text for fake planes linedef

See merge request STJr/SRB2!648

It got denied before for Software so I won't include it in the merge request :(

* Break bustable FOFs like pushables.
* Activate pushable-counting executor activators.
* Get pushed by currents/wind.

This takes advantage of the previously-existing hack relating to objects with MF_PUSHABLE infotable (but not active) flags and a nonzero fuse, which is used as the condition to group this under (rather than MT_ROLLOUTROCK specific fuckery).

Thanks to the bug report submitted by our kirbs pal for getting me off my ass this evening.

# Conflicts:
#	src/r_defs.h

Update copyright statements for changed names

See merge request !644

Fix S_HAMMER being off by one

See merge request STJr/SRB2!654

fcam simple controls but slightly less hacky

See merge request STJr/SRB2!647

Apply skin's highresscale to continue screen

See merge request !645

More OpenGL fixes plus masked PNG conversion

See merge request !619

Local Lua commands + no magic numbers

See merge request !602

Also, some minor memory efficiency fixes to both rotsprite and ordinary sprite rotations.

# Conflicts:
#	src/m_menu.c

# Conflicts:
#	src/m_menu.c

(I disagree with this feature so hard but w/e)

(cherry picked from commit fe809b27)

- Allow the translations that don't make use a blend image to work without requiring a blend image to be present
- Fix TC_RAINBOW not working properly
- TC_METALSONIC now remaps the _blend image to SKINCOLOR_COBALT, then inverts all of the blue, replicating how it works in Software

(cherry picked from commit 74d7f256)

(cherry picked from commit 4c666429)

Don't create colormap data out of sidedef text for fake planes linedef (the colormap data isn't even used anymore)