[Open Assets] Ceroba's Mask V3.0

There's been a decent amount of changes to the map, so sorry if I miss any
The map now has elevation on the start and ending section
The issue where the floor wasn't changing textures has been finally fixed
Made it so the mid-ending floor off-road and texture change at lap 3 happens after passing the midpoint of the map
Fixed 2 small invisible impassible walls on the side of the road
Added some bells to indicate where the lap 3 effect doesn't take place after passing Ceroba
Added fire pillars and fire hazards after passing Ceroba
+ some stuff I'm probably missing!

-Fixed a missing rail
-Fixed a missing texture
-Made the intro shorter, to allow the lap 1 music to play a bit more
-Added lamps to better indicate a cut, and removed the lap 3 effect on the area that has them

-Changes to the offroad so it's always petal texture to avoid confusion
-Changed both straightaways to be more fast and/or engaging
-Custom Item and Egg boxes (thx Indev)
-Custom weather effect that speeds up each lap (thx Indev)
-Added smth in Lap 3 (yet again, thx Indev)
-Added 3 boxes in the Ceroba left cut
-Completely revamped the secret area to be Ceroba's house
-Removed one small dancing Ceroba for optimaztion

Huge thanks to Indev for a lot of the LUA stuff, without him half the stuff in this update wouldn't have been possible

- Added Boss checkpoints to fix inaccurate positions (thx Stellar)
- Changed the internal name from MAPMK to MAPFM (Fox Mask) to avoid conflicts
- Changed the lamps mapthingnum to avoid conflicts
- Changed the addon name so it isn't as literal

Completely removed the pesky things that made it lag, plus added a thock wall
Added a sfx at the start of the race
Added a dancing Ceroba (sprites made by @Emb3rSwag)