refactor: unify runtime sets, update naming of event channels (#17)

Some general refactors:
Turns HeroPartySO into a runtime set class.
Make runtime set an IEnumerable
Simplify name of events

Reviewed-on: #17
Reviewed-by: zephyr <zephyr@noreply.localhost>
Co-authored-by: Michael <mep053@gmail.com>
Co-committed-by: Michael <mep053@gmail.com>

Assets/Scripts/Events/SpawnWaveEventSO.cs

@@ -4,8 +4,8 @@ using Wave;
 
 namespace Events
 {
-    [CreateAssetMenu(menuName = "Events/Spawn Wave SO Event Channel")]
-    public class SpawnWaveSOEventChannelSO : ScriptableObject
+    [CreateAssetMenu(menuName = "Events/Spawn Wave Event")]
+    public class SpawnWaveEventSO : ScriptableObject
     {
         public event UnityAction<SpawnWaveSO> OnEventRaised;