bevy_cell 0.14.0

Attach Bevy's Handles/Entities statically to Types.
Documentation 
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use bevy_cell::*;
use bevy::prelude::*;

bycell!{
    Entity: [single] [vec<>] [hashmap<u32>];
    Image: [single_e] [Mesh:raw];
    AudioSource: [Mesh|single];
    Mesh: [|single] [|vec<>] [|hashmap<u32>] [StandardMaterial|hashmap_mats<u32>] [map_e<&'static str>];
    StandardMaterial: [|single] [|vec<>] [|hashmap<u32>];
    Scene: [hashmap_e<u32>];
}

fn entities (){
    let e = Entity::PLACEHOLDER;
    Entity::set_single(e);
    Entity::set_vec([e]);
    Entity::set_hashmap([(200,e)]);
    Image::set_single_e(e);
    Mesh::set_map_e([("hello",e)]);
    Scene::set_hashmap_e([(200,e)]);
    assert_eq!(Entity::single(),Image::single_e());
    assert_eq!(Entity::vec(0),Scene::hashmap_e(&200));
    Mesh::map_e(&"hello");
}

fn handles (app: &mut App){
    let mut res = app.world_mut().resource_mut::<Assets<Mesh>>();
    let m = res.add(Cuboid::from_length(1.));
    Mesh::set_single(m.clone());
    Mesh::set_vec([m.clone()]);
    Mesh::set_hashmap([(200,m.clone())]);
    AudioSource::set_single(m.clone());
    assert_eq!(Mesh::single(),AudioSource::single());
    
    let mut res = app.world_mut().resource_mut::<Assets<StandardMaterial>>();
    let m = res.add(Color::srgb(1.,0.,0.));
    StandardMaterial::set_single(m.clone());
    StandardMaterial::set_vec([m.clone()]);
    StandardMaterial::set_hashmap([(200,m.clone())]);
    Mesh::set_hashmap_mats([(200,m.clone())]);
    assert_eq!(StandardMaterial::vec(0),Mesh::hashmap_mats(&200));
}

fn main(){
    let mut app = App::new();
    app.add_plugins(DefaultPlugins);
    entities();
    handles(&mut app);
}