gd: added menu template

addons/maaacks_game_template/base/scripts/pause_menu_controller.gd

@@ -0,0 +1,18 @@
+class_name PauseMenuController
+extends Node
+
+## Node for opening a pause menu when detecting a 'ui_cancel' event.
+
+@export var pause_menu_packed : PackedScene
+@export var focused_viewport : Viewport
+
+func _unhandled_input(event : InputEvent) -> void:
+	if event.is_action_pressed("ui_cancel"):
+		if not focused_viewport:
+			focused_viewport = get_viewport()
+		var _initial_focus_control = focused_viewport.gui_get_focus_owner()
+		var current_menu = pause_menu_packed.instantiate()
+		get_tree().current_scene.call_deferred("add_child", current_menu)
+		await current_menu.tree_exited
+		if is_inside_tree() and _initial_focus_control:
+			_initial_focus_control.grab_focus()