Attack system revamp (#82)

- Add crouch cancelling
- Add IASA for aerial attacks
- Add scaffolding for autocancel
- Add hitbox group system
- Add new ergonomic features for attack scripting
- Add more information to the hitbox viewer
- Improve the looks of debug capsules

Reviewed-on: #82
Co-authored-by: Álex Román Núñez <eirexe@eirteam.moe>

src/fighter/mod.rs

@@ -293,10 +293,16 @@ pub struct FighterActiveAttack {
     pub script: Handle<FighterAttackScript>,
     pub active_hitboxes: Vec<usize>,
     pub solved_hitboxes: Vec<attack::FighterSolvedHitbox>,
-    pub hit_fighters: Vec<Entity>,
+    pub hit_groups: Vec<FighterHitGroupState>,
     pub stalled: bool,
 }
 
+#[derive(Clone, Debug, Hash)]
+pub struct FighterHitGroupState {
+    pub group: u32,
+    pub hit_fighters: Vec<Entity>,
+}
+
 #[derive(Component, Clone, Debug, Default, Hash)]
 pub struct FighterHitboxes(pub Option<FighterActiveAttack>);