Refactor gameplay menus into owned scenes

ui/menus/FormationMenu.gd

@@ -0,0 +1,36 @@
+extends "res://ui/menus/ModalMenu.gd"
+
+signal formation_changed
+signal reset_requested
+
+@onready var editor: Control = $Editor
+@onready var reset_button: Control = $ResetButton
+
+
+func _ready() -> void:
+	super._ready()
+	reset_button.pressed.connect(func(): reset_requested.emit())
+	editor.formation_changed.connect(func(): formation_changed.emit())
+
+
+func open_menu() -> void:
+	super.open_menu()
+	editor.queue_redraw()
+
+
+func redraw() -> void:
+	editor.queue_redraw()
+
+
+func handle_unhandled_input(event: InputEvent) -> bool:
+	if not visible:
+		return false
+	if event is InputEventScreenTouch:
+		editor.handle_touch(event)
+	elif event is InputEventScreenDrag:
+		editor.handle_drag(event)
+	elif event is InputEventMouseButton:
+		editor.handle_mouse_button(event)
+	elif event is InputEventMouseMotion:
+		editor.handle_mouse_motion(event)
+	return true