Implement game logic for Ultima Underworld 2

[vividos]

This is a placeholder issue for implementing all remaining unimplemented game logic for supporting Ultima Underworld 2. If your ticket has been closed with reference to this, no worries. Eventually all of the game logic for uw2 will be implemented.

Implementing the game logic for uw2 includes at least the following tasks:

• All of the stuff from ticket Implement game logic for Ultima Underworld 1 #1
• Schedules
• Any other specialities from uw2