Function handle_asset_changes 

pub fn handle_asset_changes(
    game: ResMut<'_, BonesGame>,
    bevy_images: ResMut<'_, Assets<Image>>,
    bevy_egui_textures: ResMut<'_, EguiUserTextures>,
    bones_image_ids: ResMut<'_, BonesImageIds>,
)

System for handling asset changes in the bones asset server