Startcombat and Stopcombat do not affect music in the menu mode

When you use startcombat/stopcombat from console, you need to close console window to update music. That's because onUpdate() in local scripts does not work in menu mode. Ideally I would use an engine handler to detect when actor's AI packages change, but there seem to be no such handlers.

As an alternative solution, we may try to implement a separate update handler for menu mode, similar to onUpdate().