Fix rotation visuals desync & appearance state spam (#23016)

* Fix rotation visuals desync

* :bucklemeup:

* A

Content.Shared/Rotation/RotationVisualsComponent.cs

@@ -0,0 +1,43 @@
+using Robust.Shared.GameStates;
+using Robust.Shared.Serialization;
+
+namespace Content.Shared.Rotation;
+
+[RegisterComponent, NetworkedComponent, AutoGenerateComponentState]
+public sealed partial class RotationVisualsComponent : Component
+{
+    /// <summary>
+    /// Default value of <see cref="HorizontalRotation"/>
+    /// </summary>
+    [DataField]
+    public Angle DefaultRotation = Angle.FromDegrees(90);
+
+    [DataField]
+    public Angle VerticalRotation = 0;
+
+    [DataField, AutoNetworkedField]
+    public Angle HorizontalRotation = Angle.FromDegrees(90);
+
+    [DataField]
+    public float AnimationTime = 0.125f;
+}
+
+[Serializable, NetSerializable]
+public enum RotationVisuals
+{
+    RotationState
+}
+
+[Serializable, NetSerializable]
+public enum RotationState
+{
+    /// <summary>
+    ///     Standing up. This is the default value.
+    /// </summary>
+    Vertical = 0,
+
+    /// <summary>
+    ///     Laying down
+    /// </summary>
+    Horizontal,
+}

Content.Shared/Rotation/SharedRotationComponent.cs

@@ -1,24 +0,0 @@
-using Robust.Shared.Serialization;
-
-namespace Content.Shared.Rotation
-{
-    [Serializable, NetSerializable]
-    public enum RotationVisuals
-    {
-        RotationState
-    }
-
-    [Serializable, NetSerializable]
-    public enum RotationState
-    {
-        /// <summary>
-        ///     Standing up. This is the default value.
-        /// </summary>
-        Vertical = 0,
-
-        /// <summary>
-        ///     Laying down
-        /// </summary>
-        Horizontal,
-    }
-}

Content.Shared/Rotation/SharedRotationVisualsSystem.cs

@@ -0,0 +1,29 @@
+namespace Content.Shared.Rotation;
+
+public abstract class SharedRotationVisualsSystem : EntitySystem
+{
+    /// <summary>
+    /// Sets the rotation an entity will have when it is "horizontal"
+    /// </summary>
+    public void SetHorizontalAngle(Entity<RotationVisualsComponent?> ent, Angle angle)
+    {
+        if (!Resolve(ent, ref ent.Comp, false))
+            return;
+
+        if (ent.Comp.HorizontalRotation.Equals(angle))
+            return;
+
+        ent.Comp.HorizontalRotation = angle;
+        Dirty(ent);
+    }
+
+
+    /// <summary>
+    /// Resets the rotation an entity will have when it is "horizontal" back to it's default value.
+    /// </summary>
+    public void ResetHorizontalAngle(Entity<RotationVisualsComponent?> ent)
+    {
+        if (Resolve(ent, ref ent.Comp, false))
+            SetHorizontalAngle(ent, ent.Comp.DefaultRotation);
+    }
+}