Wraps TTF_SetFontDirection (from SDL_ttf 2.20) to set the dsdl2.ttf.Font's script direction
new script dsdl2.ttf.Direction for the dsdl2.ttf.Font
dsdl.SDLException if unable to set script direction
See Implementation
Wraps TTF_SetFontDirection (from SDL_ttf 2.20) to set the dsdl2.ttf.Font's script direction