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/Administration/AdminFrozenSystem.cs

@@ -2,6 +2,7 @@ using Content.Shared.ActionBlocker;
 using Content.Shared.Interaction.Events;
 using Content.Shared.Item;
 using Content.Shared.Movement;
+using Content.Shared.Movement.Events;
 using Content.Shared.Physics.Pull;
 using Content.Shared.Pulling;
 using Content.Shared.Pulling.Components;