dispose method
Releases everything this controller owns. The page that created the controller calls this from its own
State.dispose(); a subclass that adds its own notifiers overrides this and ends with super.dispose().
Implementation
@override
void dispose() {
titleController.dispose();
addressController.dispose();
phoneController.dispose();
capacityController.dispose();
entranceController.dispose();
hourlyController.dispose();
dailyController.dispose();
super.dispose();
}