Initial work on ledge & improved baking of root motion. (#90)

Reviewed-on: #90
Co-authored-by: Álex Román Núñez <eirexe@eirteam.moe>

src/fighter/state/air.rs

@@ -1,5 +1,6 @@
 use crate::fighter::state::jump::{self};
 use crate::fighter::state::land::{LandingState, LandingType};
+use crate::fighter::state::ledge_wait::LedgeWaitState;
 use crate::fighter::state::{
     CollisionContext, FighterState, InterruptContext, air_attack, air_dodge,
 };
@@ -126,6 +127,15 @@ pub fn collision_interrupt(
     landing_type: LandingType,
     can_ignore_soft_platforms: bool,
 ) -> Option<FighterState> {
+    if ctx.velocity.y <= FGi32::ZERO {
+        if let Some(ledge_result) = ctx.air_collide_with_ledges() {
+            return Some(FighterState::LedgeWait(LedgeWaitState {
+                airborne_state_common: AirborneStateCommon::default(),
+                ledge_id: ledge_result.ledge,
+            }));
+        }
+    }
+
     let res = ctx.air_collide_with_stage(can_ignore_soft_platforms)?;
     let diff = res.hit_position - ctx.translation.0;
     ctx.ecb.bottom -= diff;