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/Movement/Events/RelayMoveInputEvent.cs

@@ -0,0 +1,13 @@
+using Robust.Shared.Players;
+
+namespace Content.Shared.Movement.Events;
+
+public sealed class RelayMoveInputEvent : EntityEventArgs
+{
+    public ICommonSession Session { get; }
+
+    public RelayMoveInputEvent(ICommonSession session)
+    {
+        Session = session;
+    }
+}