Fix match state remaining mutable after and of match and implement initial work on aerials (#77)

Reviewed-on: #77
Co-authored-by: Álex Román Núñez <eirexe@eirteam.moe>

src/fighter/animation.rs

@@ -98,4 +98,5 @@ pub enum AnimKind {
     AttackUpTilt,
     AttackForwardTilt,
     AttackDownTilt,
+    AttackNeutralAir,
 }