add holding?(key_symbol) to check of a button is currently pressed down. works as Gosu::button_down? but with Chingu-key-constants instead.
add holding?(key_symbol) to check of a button is currently pressed down. works as Gosu::button_down? but with Chingu-key-constants instead.

Spooner/chingu,rkachowski/chingu,ndrluis/chingu,ippa/chingu