- Split MF2_DONTDRAW into MFD_DONTDRAWP[1-4], also replaces MFE_DRAWONLYFORP[1-4].
- Split MF2_SHADOW into MFD_FULLBRIGHT and MFD_TRANS80. I also added an entire spectrum of options for transparency & brightness overrides, since I've found myself wishing for stuff like that before.
- Tethering was updated for it's client-sided drawing to apply to splitscreens too.
- Removed cv_transparency.
The transparency overrides don't seem to work yet (obvious on things using MFD_SHADOW), just running out of time to look into it so I'm pushing what I have.
* Multiplied rain speed by 3, per Oni's request.
* Disable weather density - force to 1 if weather draw distance, otherwise zero
* Move the ceilingpic check into a more convenient part of the weather spawning loop.
* `drawdist_precip_cons_t` - replaces "Infinite" with "None".
* Disable the lowest normal draw distance (256), given... both kart and srb2 are basically unplayable like that.
* Disable cv_drawdist_nights entirely.
