Make the buttons holdable #19
Description
Currently the d-pad and other buttons only activate on tap. They should also do a repeat action if held, as the keyboard buttons do. Eg when holding the down arrow on keyboard, we navigate down over and over at a certain speed. The on screen controls should match that behavior as a Gameboy would.
We also want the ability to press two buttons at once and get a different effect, eg SELECT+ENTER could do something different than just ENTER. How can we accomplish this with touch controls as well as keyboard controls?