Also includes splitting the starpost logic into its own function.

Add textmap vertex slope support

See merge request !633

Fix incorrect cast

See merge request STJr/SRB2!669

Brick Block Bustin

See merge request STJr/SRB2!666

Don't give player translucency when looking down with the orbital camera

See merge request STJr/SRB2!659

Accurate papersprite projection

See merge request STJr/SRB2!657

Showconditionset

See merge request STJr/SRB2!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 STJr/SRB2!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.

Software FOV

See merge request STJr/SRB2!662

Don't clip player MD2 when looking straight down with the orbital camera

See merge request STJr/SRB2!658

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 :(

In theory, should be a performance improvement. In practice idk

I heard properpaper had some weird crashes? I couldn't reproduce
them no matter how hard I tried, but I added some bounds checking
to this version too just in case. Gotta get other people's help
to try to reproduce those.

* 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