Body code cleanup (#24946)

* Fix test

* Kill float accumulators

* Use entity proxy methods

* DataField auto name generation where possible

* Kill comp properties

* Clean up server comps

* Make events record structs

* Clean up shared body code

* Clean up server body code

* Rename organ events to be same names as in med refactor

Content.Shared/Body/Events/ShiverAttemptEvent.cs

@@ -1,12 +1,8 @@
-namespace Content.Shared.Body.Events
-{
-    public sealed class ShiverAttemptEvent : CancellableEntityEventArgs
-    {
-        public ShiverAttemptEvent(EntityUid uid)
-        {
-            Uid = uid;
-        }
+namespace Content.Shared.Body.Events;
 
-        public EntityUid Uid { get; }
-    }
+[ByRefEvent]
+public record struct ShiverAttemptEvent(EntityUid Uid)
+{
+    public readonly EntityUid Uid = Uid;
+    public bool Cancelled = false;
 }