function init(self)
   -- Add initialization code here
   -- Remove this function if not needed
end

function final(self)
   -- Add finalization code here
   -- Remove this function if not needed
end

function update(self, dt)
   -- Add update code here
   -- Remove this function if not needed
end

function on_message(self, message_id, message, sender)
   -- Add message-handling code here
   -- Remove this function if not needed
end

function on_input(self, action_id, action)
   -- Add input-handling code here
   -- Remove this function if not needed
end

function on_reload(self)
   -- Add input-handling code here
   -- Remove this function if not needed
end