Create a new SDLRenderer for the window using the indexth renderer according to flags

Use an index of -1 to get the default renderer for the given flags.

Property definitions

sdl2 $ SDLRenderer :: new
	# Create a new `SDLRenderer` for the `window` using the `index`th renderer according to `flags`
	#
	# Use an `index` of `-1` to get the default renderer for the given flags.
	new (window: SDLWindow, index: Int, flags: SDLRendererFlags) `{
		return SDL_CreateRenderer(window, index, flags);
	`}
lib/sdl2/sdl2_base.nit:234,2--239,3