anchor: love.keyboard.isDown
  Checks whether a certain key is down. Not to be confused with love.keypressed or love.keyreleased.
  down = love.keyboard.isDown( key )
  key KeyConstant The key to check.
  down boolean True if the key is down, false if not.
  anyDown = love.keyboard.isDown( key, ... )
  key KeyConstant A key to check.
  ... KeyConstant Additional keys to check.
  anyDown boolean True if any supplied key is down, false if not.