On-screen touch control art

From Xelu's "Free Controller & Keyboard Prompts" pack (Nicolae Berbece / Those Awesome Guys), public domain under CC0: https://thoseawesomeguys.com/prompts/

256px Nintendo Switch set, renamed for src/core/TouchControls.lua: d-pad (neutral + per-direction highlight), A, B, plus (START) and minus (SELECT).