Polyobj setup fixes

If you're wondering why ERZ2 crashes lately, yes, it's my fault once again it turns out! Ideally we shouldn't have loose spawn points or anchors without an actual PolyObject to go with them in the first place, but this fix re-adds the safety check that prevented them from crashing the game before.

If it wasn't clear already, this fix is rather important, so please get in asap.

See merge request !7

Rerevert unreversion of reversion

This commit got overwritten somehow when things were being merged into master. It's kind of important. A lot of maps will break without it.

See merge request !6

Derp, disabling Polyobj_findExplicit apparently blocked off the one thing preventing ERZ2 from crashing before (since it has rogue spawn points without actual First Lines to go with them, for whatever reason)

This reverts commit 9e306394.
Sorry MI, but this completely breaks large maps like AGZ.

New player animations (Updated player.dta Sonic)

Adds support for several completely new player animations, mostly for Super Sonic.

See merge request !5

When Super Sonic is "walking in the air", he has a
unique animation for it now which is similar to how
it looked in previous SRB2 versions.

States were being improperly checked where a panim
would be more appropriate.

Hotfix pltz

This is the sister merge request of http://git.magicalgirl.moe/STJr/SRB2/merge_requests/14 updated to be compatible with Internal/master's conflicting changes.

See merge request !3

Conflicts:
	src/p_mobj.c

Conflicts:
	src/lua_mobjlib.c

wolfs authored 10 years ago and Alam Ed Arias committed 9 years ago

Fixes https://mb.srb2.org/showthread.php?t=40279

Should work fine, but do keep in mind that this fix is untested.

Goo Water (THZ Goop) adjustements

At Nev3r's request:
Adjusted goop so that you spend less time bouncing around in it. The goop will become a walkable surface with a higher velocity threshold.

The actual goop physics haven't been altered as far as the initial entrance and underwater time is concerned, only leaving goop and subsequent bounces has been dampened significantly.

See merge request !7

finesine table

I pasted in finesine from #11 and made a merge request.

This has been lightly tested to ensure the renderer doesn't immediately break. No ill effects have been observed so far.

See merge request !17

A_SetObjectFlags tweak

Only reset the sector/blockmap links on an object calling A_SetObjectFlags if the MF_NOSECTOR|MF_NOBLOCKMAP flags change. Fixes a freeze related to LD442 demonstrated in MascaraSnake's example WAD at https://dl.dropboxusercontent.com/u/27962790/statetest.wad .

See merge request !11

Re-add/fix broken platform momz mobj code.

The changes in this branch re-add the platform's momentum to players and mobjs which leave the platform (eg. by jumping) so that they move with relative velocity as expected. This behavior was unintentionally broken in SRB2 2.0, which adds a lot of artificial difficulty to certain segments of the levels, where you have to jump between high velocity moving platforms which seemingly cut your jump height to nothing.

Not only has the behavior been fixed, but it has now been enhanced to move the camera while free-falling between platforms as well, completing the illusion of full relative velocity with minimal hiccups. [Observe.](http://i.imgur.com/zmSfUyp.gifv)

See merge request !14

Miscellanous fixes to merge

These are the commits from the "miscellanous-fixes" branch that are okay to merge in.

Bugs fixed include the following:
* CTF flags respawning incorrectly: they cannot z position themselves correctly, and they cannot flip themselves.
* The weird "jumping" spring/monitor effect: this is the result of an internal mobj_t pointer (tmfloorthing, specifically) not resetting itself to NULL for the next object's thinker, resulting in Z movement code thrusting the object vertically at tmfloorthing->momz.

See merge request !18

Make sure "word" in readlevelheader gets reset

... because some things (Lua. custom header entries) move it.
https://mb.srb2.org/showthread.php?t=40580

(Technically breaks netgame compatibility for Lua-heavy mods, so in next.)

That's supposed to be run once a frame, not once per hook
per mobj per frame you moron. If you just run it seven
thousand times a frame, of course your framerate will drop.

finesine[0] == 0 now. This naturally fixes a bunch of math fudging.
No ill effects have been observed so far.

Stupid JTE.

Dummy, what do you think you're doing? If you
just push mobjs and players into Lua all willy-
nilly everywhere, you'll wind up generating
tons of metatables and stuff you arne't even
gonna use!

Oh. Thanks me, I'm really smart.

I can't just say screw it and include the full
doomtype.h here (windows.h conflict?) so a
small hack here will have to do. :I

This _should_ solve some significant performance
issues Lua experiences. If not, I will be very
upset for having wasted so much time and effort.

There will be bugs, this kind of thing needs to
be thuroughly tested and this is just the first
iteration of it.

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

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

Assume that every frame the player is on the ground, their pmomz will
be re-set properly if the floor is moving, therefore if the platform
STOPS, we need this to set it to 0.

tmfloorthing and tmhitthing are set to NULL at the start of P_MobjThinker, preventing any weird cases of carrying over the previous mobj's floor object or such.

This fixes the issue with upside-down springs shooting downwards if you touch another of its kind. Also fixes one of the issues with monitors in Icicle Falls (after you phase inside the East-most float-bob FOF's monitor via the other bug and jump up to break it while there, the NEXT monitor moves upwards too)

This partially reverts commit a1c67e7e.

It didn't work at all before, oops. :/

Hotfix netgame sprite2

This fixes sprite2 not being properly added to $$$.sav because MD_SPRITE wasn't getting set.

See merge request !2

For Super Missiles, the Super Sonic player
has a seperate animation from normal pain.

It wasn't properly added to $$$.sav because
MD_SPRITE didn't get set. :/

Every SPR2_ except for SIGN and LIFE now has a proper
fallback leading down to SPR2_STND.

Here's how it works: When a player walks off the
moving platform, it applies their pmomz once, and
then _keeps pmomz set_ so that the camera still
adds pmomz to its movements until they hit another
floor. This way, the camera doesn't jerk around.