Add PlayerSpawn hook to Lua
I don't know how I did this but I did. Something about staring at code from 3AM till 5AM...
Here's a test script too:
```Lua
addHook("PlayerSpawn", function(player) player.health = 99 end)
```
See merge request !48
Version constants for Lua
Pretty simple thing. Allows scripters to use VERSION, SUBVERSION, and VERSIONSTRING to check the game's version and potentially futureproof scripts. Have tested and confirmed working on my end.
See merge request !55
BACKPORT: removal of music slots
Relevant commits cherry-picked. Basically everything except the internal music track name switches.
See merge request !43
BACKPORT: FF_ANIMATE simplistic state animations
this is a lot more complex due to the need to remove the dispoffset related code as well as a lot of the redefinitions; combined with the code changes due to the sprite2 system in internal master.
~~BEFORE ACCEPTING THIS: get sryder to look at and fix any possible brokenness with OpenGL MD2s~~
See merge request !45
Fof flag change hotfix
This fixes rendering issues caused by changing FOF flags mid-level via Lua or linedef type 445. Everything else that toggles FF_EXISTS already had this fix it turns out.
Not sure if this is safe for master too, could someone check that for me?
See merge request !53
This fixes how removing certain flags (such as FF_EXISTS) from FOFs can cause HOMs on walls bordering their target sectors. Also fixes how the force-FOF-to-vanish linedef special can leave behind the FOF's shadow
Fix chain launching
Basically you're not allowed to launch off a chain the frame you touch it anymore.
Coincidentally the changes here allow you to actually use PF_*STASIS in a Lua script now and have it work as you'd expect it to (it lasts for a tic).
See merge request !49
cpuaffinity/sdl_mixer changes
Hopefully this will alleviate SDL2 sound issues.
If not, hopefully this will give us info on what the hell is going on.
See merge request !51
Monster misc 2
Just some clean-up in doomdef.h, nothing important or majorly game-breaking really. It's all stuff that apparently hasn't been used by the game itself in many years by now.
...
inb4 I find something else obsolete to kill later and make monster misc branch no. 3
See merge request !52
