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/schedule.rs

@@ -9,6 +9,8 @@
 use bevy::prelude::*;
 use bevy_ggrs::prelude::*;
 
+use crate::match_runtime::match_is_ongoing;
+
 #[derive(SystemSet, Debug, Clone, PartialEq, Eq, Hash)]
 pub enum GameplaySet {
     /// Turn this frame's netcode inputs into per-fighter input state.
@@ -25,6 +27,8 @@ pub enum GameplaySet {
     Animation,
     /// Resolve attacks
     Attacks,
+    /// Advance match rules and detect the end of the match.
+    MatchRules,
 }
 
 /// Declares the order of [`GameplaySet`] inside [`GgrsSchedule`]. Added by
@@ -43,8 +47,10 @@ impl Plugin for GameplaySchedulePlugin {
                 GameplaySet::Animation,
                 GameplaySet::Collision,
                 GameplaySet::Attacks,
+                GameplaySet::MatchRules,
             )
-                .chain(),
+                .chain()
+                .run_if(match_is_ongoing),
         );
     }
 }