Refactor shared specialize params into a SystemParam

[greeble-dev]

Objective

Refactor parameters shared between various specialize systems into one SystemParam. This is mainly to stop systems exceeding the maximum number of parameters, but is a bit cleaner too and include some minor 2D/3D unification.

Background

As part of #18074 I added a parameter to specialize_material_meshes. This exceeded the maximum number of parameters allowed in a system. Initially I moved parameters into tuples, but it was suggested that a SystemParam might be a cleaner fix.

Solution

Add a struct for parameters shared between all specialize systems:

#[derive(SystemParam)]
pub struct SpecializeMeshParams<'w, M: Send + Sync + 'static, RenderMeshInstances: Resource> {
    pub pipeline_cache: Res<'w, PipelineCache>,
    pub entity_specialization_ticks: Res<'w, EntitySpecializationTicks<M>>,
    pub render_mesh_instances: Res<'w, RenderMeshInstances>,
    pub render_meshes: Res<'w, RenderAssets<RenderMesh>>,
    pub ticks: SystemChangeTick,
}

This meant some refactoring:

• Merged duplicate EntitySpecializationTicks structs in bevy_pbr and bevy_sprite and moved them to bevy_render.
• Changed wireframe pipeline to use EntitySpecializationTicks instead of its own type.

Concerns

Maybe this PR does too much. Updating just the 3D parts would make it simpler, then the 2D parts could be a follow up PR.

Testing

Ran testbed_3d/2d, wireframe_3d/2d, deferred_rendering, motion_blur, lighting, and a few other examples. Win10/Nvidia across Vulkan, WebGL/Chrome, WebGPU/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.