Jetpacks (#9023)

* Movement acceleration

* tweaks

* Weightless refactor coz fuck it

* CCVars

* weightless movement tweaks

* Some cleanup while I'm here

* dorkpacks

* thanks fork

* fixes

* zoomies

* toggles

* hmm

* yamls

* b

* so true

* Effects refactor

* namespace

* review

Content.Shared/Spawners/EntitySystems/SharedTimedDespawnSystem.cs

@@ -0,0 +1,28 @@
+using Content.Shared.Spawners.Components;
+using Robust.Shared.Timing;
+
+namespace Content.Shared.Spawners.EntitySystems;
+
+public abstract class SharedTimedDespawnSystem : EntitySystem
+{
+    [Dependency] private readonly IGameTiming _timing = default!;
+
+    public override void Update(float frameTime)
+    {
+        base.Update(frameTime);
+
+        if (!_timing.IsFirstTimePredicted) return;
+
+        foreach (var comp in EntityQuery<TimedDespawnComponent>())
+        {
+            if (!CanDelete(comp.Owner)) continue;
+
+            comp.Lifetime -= frameTime;
+
+            if (comp.Lifetime <= 0)
+                EntityManager.QueueDeleteEntity(comp.Owner);
+        }
+    }
+
+    protected abstract bool CanDelete(EntityUid uid);
+}