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The FocusManager constructor was registering global event handlers on the shared RawKeyboard instance and the global pointer router. This posed a few problems: (1) there was no way to unregister these handlers, and (2) instantiating a second FocusManager would overwrite the existing focus manager's RawKeyboard handler. This was manifesting in unexpected ways, such as the fact that constructing a second BuildOwner (for a parallel tree, for instance) was obliterating the event handler for the main BuildOwner's focus manager, thus messing with focus. This change separates those global event registrations into a dedicated method, registerGlobalHandlers(), and overrides dispose() to properly unregister those handlers.
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