Get wavelands off platforms to work close to platform edges#153

Wavelands off platform edges currently don’t work if you’re too close to the edge of the platform when you attempt them; this is easily seen by rolling to the edge of the platform, then dropping under it, jumping, and trying to waveland off (while keeping the control stick in a neutral position until the airdodge). This seems to be occuring because the game’s waveland logic checks on frame 1 of the airdodge, by which time the character is no longer above the platform; a way to calculate the character’s initial position on “frame 0” before they move would be needed