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/Components/ActiveJetpackComponent.cs

@@ -0,0 +1,13 @@
+using Robust.Shared.GameStates;
+
+namespace Content.Shared.Movement.Components;
+
+/// <summary>
+/// Added to an enabled jetpack. Tracks gas usage on server / effect spawning on client.
+/// </summary>
+[RegisterComponent, NetworkedComponent]
+public sealed class ActiveJetpackComponent : Component
+{
+    public float EffectCooldown = 0.3f;
+    public float Accumulator = 0f;
+}