Function azul_core::app_resources::add_resources

pub fn add_resources<T: FontImageApi>(
    app_resources: &mut AppResources, 
    render_api: &mut T, 
    pipeline_id: &PipelineId, 
    add_font_resources: Vec<(ImmediateFontId, AddFontMsg)>, 
    add_image_resources: Vec<(ImageId, AddImageMsg)>
)

Submits the AddFont, AddFontInstance and AddImage resources to the RenderApi. Extends currently_registered_images and currently_registered_fonts by the last_frame_image_keys and last_frame_font_keys, so that we don't lose track of what font and image keys are currently in the API.