add shader_def to albedo ColorSource and auto import trait in macro

bevy_derive/src/lib.rs

@@ -159,6 +159,7 @@ pub fn derive_uniforms(input: TokenStream) -> TokenStream {
             // TODO: this will be very allocation heavy. find a way to either make this allocation free
             // or alternatively only run it when the shader_defs have changed
             fn get_shader_defs(&self) -> Option<Vec<String>> {
+                use bevy::render::render_graph::ShaderDefSuffixProvider;
                 let mut potential_shader_defs: Vec<(&'static str, Option<&'static str>)> = vec![
                     #((#shader_def_field_name_strs, self.#shader_def_field_names.get_shader_def()),)*
                 ];

src/render/render_graph/uniforms/standard_material.rs

@@ -5,6 +5,7 @@ use bevy_derive::Uniforms;
 
 #[derive(Uniforms)]
 pub struct StandardMaterial {
+    #[uniform(shader_def)]
     pub albedo: ColorSource,
 }