turnip: implement legacy API functions separately
Move legacy API functions to a separate file, and implement them by calling the new API functions, like tu_CreateRenderPass was already doing.
Due to an influx of spam, we have had to impose restrictions on new accounts. Please see this wiki page for instructions on how to get full permissions. Sorry for the inconvenience.
Move legacy API functions to a separate file, and implement them by calling the new API functions, like tu_CreateRenderPass was already doing.