PS2 -> B2 changes

[f-wlen ice loop]

- Hitboxes for airthrow loops have been adjusted. For reference, here are the staple Ren combos.

Doubleice combo: ... -> 236C 236[A] 236[ B] j.BC dj.BC airthrow. This is your fallback when one of the airthrow combos won't work.
Airthrow relaunch combo: ... -> 236C 236[A] j.C airdash airthrow 5AC(2) j.BC dj.BC airthrow. This now works on the majority of the cast.
Rethrow combo: 2B 4B 2A(whiff) airthrow 5AC(1) 236C ... ->. Very stylish and hard to do, plus it leads into EX Ice which allows for the highest damage potential of these combos.

Easy Tier: Arcueid, Sion, V.Sion, Shiki, Walachia, Nero, Kohaku
Tricky Tier: Akiha, Aoko, Kouma, Ciel, Warcueid, Nanaya, Hisui, M.Hisui
Impossible Tier: Ren, Miyako, W.Ren, V.Akiha, Satsuki, Neco-Arc, Neco-Arc Chaos

Still need to do further testing, as there are a number of ways you can alter the combo: no delay between 2B 5B, early j.C instead of mid/late, later airthrow, etc

- Less slowdown during EX Ice making doubleice combo easier to do. Still the same timing and tricks involved.
- 2B (delay) 5B needs less delay due to tweaks made to falling speed.
- Optimal BnB off 2A: 2AA 5C(3/4) 4B j.BC dj.C airthrow
- Optimal BnB off 2B: 2B (delay) 5BC(2) j.BC dj.BC airthrow

- Blackcat, obviously. 214B[6].