Implement damage UI, damage and stale moves. (#45)

Reviewed-on: #45
Co-authored-by: Álex Román Núñez <eirexe@eirteam.moe>

src/fighter/mod.rs

@@ -259,6 +259,7 @@ pub struct FighterActiveAttack {
     pub active_hitboxes: Vec<usize>,
     pub solved_hitboxes: Vec<attack::FighterSolvedHitbox>,
     pub hit_fighters: Vec<Entity>,
+    pub stalled: bool
 }
 
 #[derive(Component, Clone, Debug, Default, Hash)]