Refactor shared specialize params into a SystemParam

[greeble-dev]

Objective

Refactor parameters shared between various specialize systems into one SystemParam. This will unblock a crash fix (#18074). It's also a bit cleaner and might help with future refactoring.

Background

As part of #18074 I needed to add a parameter to specialize_material_meshes, but this would have pushed it over the maximum number of parameters allowed in a system. I could have dodged the limit by moving parameters into tuples, but it was suggested that a SystemParam might be a cleaner fix.

Solution

Take five parameters common to all specialize systems and put them in a single SpecializeMeshParams struct.

 pub fn specialize_material_meshes(
+    params: SpecializeMeshParams<EntitySpecializationTicks, RenderMeshInstances>,
-    render_meshes: Res<RenderAssets<RenderMesh>>,
     params: SpecializeMeshParams<EntitySpecializationTicks, RenderMeshInstances>,
     render_materials: Res<ErasedRenderAssets<PreparedMaterial>>,
-    render_mesh_instances: Res<RenderMeshInstances>,
     render_material_instances: Res<RenderMaterialInstances>,
     render_lightmaps: Res<RenderLightmaps>,
     render_visibility_ranges: Res<RenderVisibilityRanges>,
     views: Query<(&ExtractedView, &RenderVisibleEntities)>,
     view_key_cache: Res<ViewKeyCache>,
-    entity_specialization_ticks: Res<EntitySpecializationTicks>,
     view_specialization_ticks: Res<ViewSpecializationTicks>,
     mut specialized_material_pipeline_cache: ResMut<SpecializedMaterialPipelineCache>,
     mut pipelines: ResMut<SpecializedMeshPipelines<MaterialPipelineSpecializer>>,
     pipeline: Res<MaterialPipeline>,
-    pipeline_cache: Res<PipelineCache>,
-    ticks: SystemChangeTick,
)

Testing

Ran testbed_3d, testbed_2d, wireframe, wireframe_2d, deferred_rendering, motion_blur, lighting, and a few other examples. Win10/Nvidia across Vulkan, WebGL/Chrome.

[tychedelia]

I had something similar like this in the past but one of the frustrations here is that 2d is left out because it doesn't share a material trait. Doesn't mean we shouldn't do this, though.

[greeble-dev]

I've updated the PR to include 3D wireframes. Note that this meant a bit of refactoring - WireframeEntitySpecializationTicks is replaced by EntitySpecializationTicks<WireframeMaterial>.

I think I can also support the 2D pipeline. Maybe that's too much for one PR, but I'll try it and see.

[greeble-dev]

Updated with 2D support and made ready for review. The description has been updated to note that 2D support might have been better as a follow up PR.

[greeble-dev]

Changed this from get_mut to get. Which seems safe but raising it just in case.

[atlv24]

I know that this is sometimes done intentionally to trigger change detection, but if its not documented as such i think its fine to assume it was unintentional.

[greeble-dev]

Fixed merge conflicts but reverted EntitySpecializationTicks unification - got too complicated for this PR after the type erased material changes.