Implement hitbox viewer (#81)

Reviewed-on: #81
Co-authored-by: Álex Román Núñez <eirexe@eirteam.moe>

src/fighter/animation.rs

@@ -99,4 +99,5 @@ pub enum AnimKind {
     AttackForwardTilt,
     AttackDownTilt,
     AttackNeutralAir,
+    AttackForwardAir,
 }