Add a simplified version of input remapping

gui/input_mapping/ActionRemapButton.gd

@@ -0,0 +1,35 @@
+extends Button
+
+export(String) var action = "ui_up"
+
+func _ready():
+	assert(InputMap.has_action(action))
+	set_process_unhandled_key_input(false)
+	display_current_key()
+
+
+func _toggled(button_pressed):
+	set_process_unhandled_key_input(button_pressed)
+	if button_pressed:
+		text = "... Key"
+		release_focus()
+	else:
+		display_current_key()
+
+
+func _unhandled_key_input(event):
+	# Note that you can use the _input callback instead, especially if
+	# you want to work with gamepads.
+	remap_action_to(event)
+	pressed = false
+
+
+func remap_action_to(event):
+	InputMap.action_erase_events(action)
+	InputMap.action_add_event(action, event)
+	text = "%s Key" % event.as_text()
+
+
+func display_current_key():
+	var current_key = InputMap.get_action_list(action)[0].as_text()
+	text = "%s Key" % current_key