2022-07-05 RMUI Renderer Platf

SFML https://github.com/SFML/SFML
renderer 的接口协议是 https://www.libsdl.org/
Simple DirectMedia Layer https://www.libsdl.org/download-2.0.php#source

• Renderer: Implements the render interface for a given rendering API, and provides initialization code when necessary.
• Platform: Implements the system interface for a given platform (operating system or window library), and adds procedures for providing input to RmlUi contexts.
• Backend: Combines a renderer and a platform for a complete solution sample, implementing the basic Backend interface.