Slide Kick

When a slide kick is happening:

1. If actionTimer > 30 or yPos - floorHeight > 500; Freefall
2. update_air_without_turn
3. switch perform_air_step():
   1. case AIR_STEP_NONE
      1. if actionState == 0, change angle
      2. break
   2. case AIR_STEP_LANDED
      1. if actionState != 0 or vel[1] >= 0; Slide Kick Slide
      2. else velocity is negative; set velocity to -velocity/2, actionState to 1, actionTimer to 0, play_mario_landing_sound and break
   3. case AIR_STEP_HIT_WALL, cap speed to 0, Backward Air Knockback
   4. case AIR_STEP_HIT_LAVA_WALL, change angle, make sure speed is at least 24, damage, Lava Boost

Slide Kick
Properties
Hex	todo
Action Flags	todo
Action Group	Airborne
ID	todo

(perform_air_step returns NONE if all quartersteps were cancelled)