Fix subpass iteration

Cleanup: EEVEE: Remove EEVEE_material_default_render_pass_ubo_get

Cleanup: EEVEE: Remove Unused variable after refactor.

Cleanup: EEVEE: Split LUT generation code from eevee_material.c

EEVEE: Fix assert during default shader compilation

The default shader could have been requested as deferred and then as non
defered. This could make the shader compilation assert.

Cleanup: DRW: Remove unused DRW_shgroup_hair_create/DRW_shgroup_material_hair_create

Cleanup: EEVEE: Move shader related function to eevee_shaders.c

EEVEE: Rewrite Passes and Material handling

Passes of the same type are now chained together and reusing the same
shgroup when possible.

Materials are now always handled as a nodetree compiled shader (GPUMaterial)
even for default materials.

Render passes use a ubo reference to change output pass type instead of
creating a lot of DRWPasses.

# Conflicts:
# source/blender/draw/engines/eevee/eevee_materials.c

DRW: Expose DRW_shgroup_add_material_resources for better flexibility

DRW: Add pass chaining and instances

Instancing will draw the same shgroups but with the instancer pass' state.

Chaining (linking) will render multiple passes by just calling DRW_draw_pass
on the first one.

DRW: Add texture ref persist, block ref and block ref persist uniforms

EEVEE: Use alpha hash shader for alpha clip material

This reduces the number of shader combination. We use the nodetree material
output node shader code to do the alpha comparison.

EEVEE: Rename / merge passes using new DRWPass chaining/instancing

Now calling DRW_pass_draw on material_ps will draw all opaque passes.
Same for depth_ps for opaque prepass.

EEVEE: Make lit_surface_vert.glsl usable for depth pass

GPUMaterial: Expose shader getter