Allows for custom weather types.
In SOC:
```Freeslot
PRECIP_GROOVY
Weather PRECIP_GROOVY
Type = MT_PARTICLE
Effects = PRECIPFX_THUNDER|PRECIPFX_LIGHTNING```
In Lua:
```freeslot("PRECIP_GROOVY")
precipprops[PRECIP_GROOVY] = {
type = MT_PARTICLE,
effects = PRECIPFX_THUNDER|PRECIPFX_LIGHTNING
}```
Then in level header, simply set `Weather = PRECIP_GROOVY`.
Other properties are part of the object itself:
- Falling speed is set as the object's speed
- Sound ID is set via the object's SeeSound
- Sound frequency is set by the object's Mass.
An explanation for the approach: I started writing a whole system where an extra pflag would be defined for "colour is not currently the player's ACTUAL colour". Then I looked at the actual code flow that would be affected by it - the single line guarded by `if (forcereset)` - and decided it was simpler to just do an extra write in this once-per-player-per-frame function instead of increasing across-the-board complexity.
Since your acceleration is tied to your top speed, we need to do this to ensure we're ONLY increasing the top speed, and not how fast they make it to that top speed.
* Reset usejoystick if a second player enters and then backs out.
* Make Split Device mode controlled by L and R (aka drift and item) pressed at the same time, not C by itself.
* Make pressing the Split Device button combo when you're at max remove all extra keyboard players.
* Fix Split Device being possible to activate on Profile char/follower setup.
Also:
* Fix a crash with exiting from top-level Profile setup.
* Allow B (lookback) to be used as a back button on menus, too.
* Clean up a bunch of extra whitespace.
Makes slopes at a great enough steepness able to match the contrast of walls.
COMING SOON: Directional lighting & contrast modifier, as options for map header.
- Reorganized bot traversal
- Blocking line traversal includes tripwire
- Next waypoint detection uses blocking line trace now (this means bots can't sit outside of a tripwire wanting to go through it)
(The more this issue happens, the more we need to take the GZDoom approach of keeping this shit in a struct that you have to put in as a function argument, instead of global variable hellzone...)
