Decouple Lights from Toggleable Visuals (and headphone music notes bugfix) (#35341)

* - Combine enum keys `ToggleableLightVisuals` and `ToggleVisuals` into `ToggleableVisuals`
- Rename `ToggleableLightVisualsComponent` to `ToggleableVisualsComponent` and `ToggleableLightVisualsSystem` to `ToggleableVisualsSystem`
  - (The `SpriteLayer` field on the component is now required because the old default of `light` doesn't make sense anymore)
- Make it so that `ToggleableVisualsComponent` works even when there's not a light attached to the entity
  - (Amazingly this seems to have only applied to  Headphones, but I can only imagine there are many other things people would like to do with simple toggleable visuals)
- Explicitly make `ItemTogglePointLightComponent`'s purpose to make `ToggleVisualsComponent` apply to `PointLightComponent`s on the same entity.
  - Add field `ToggleableVisualsColorModulatesLights`, which makes the `Color` appearance value of `ToggleableVisuals` modulate the color of lights on the same entity
  - Lots of prototype updates to uptake the above

* fix bad merge

* unbork robust

* blindly letting rider reformat stuff

* I guess I never cleaned up these imports at all

Content.Shared/Light/Components/ItemTogglePointLightComponent.cs

@@ -1,12 +1,18 @@
+using Content.Shared.Item.ItemToggle.Components;
 using Robust.Shared.GameStates;
+using Content.Shared.Toggleable;
 
 namespace Content.Shared.Light.Components;
 
 /// <summary>
-/// Toggles point light on an entity whenever ItemToggle hits.
+/// Makes <see cref="ItemToggledEvent"/> enable and disable point lights on this entity.
 /// </summary>
 [RegisterComponent, NetworkedComponent]
 public sealed partial class ItemTogglePointLightComponent : Component
 {
-
+    /// <summary>
+    /// When true, causes the color specified in <see cref="ToggleableVisuals.Color"/>
+    /// be used to modulate the color of lights on this entity.
+    /// </summary>
+    [DataField] public bool ToggleableVisualsColorModulatesLights = false;
 }