Is this a movement event?

Property definitions

	# Is this a movement event?
	fun is_move: Bool is abstract

lib/mnit/input.nit:41,2--42,30

	redef var is_move

lib/gamnit/input_ios.nit:38,2--18

	redef fun is_move do return motion_event.acting_pointer == self and
		motion_event.native.action.is_move

lib/android/input_events.nit:195,2--196,36

	redef fun is_move do return buffer.is_mouse_motion

lib/gamnit/gamnit_linux.nit:140,2--51