Handle focus events for UI components.

The help-dialog UI component was ignoring requests to "hide" when other
frames are focused (because previously it covered the whole screen, and
no other frame could get the focus).

With f0911e52f0e71c6d2539bdc74a09ff2dbd5ab125, the help dialog no longer
covers the whole screen, so it must listen for and react to
"frameFocused" events.

However, the help dialog should not "hide" when the frame that is
focused is itself!  This required a little extra plumbing.  That
plumbing is helpful, though, because it allows individual UI components
to decide what to do when another frame receives the focus (as opposed
to the previious version, which simply unilaterally sent a "hide"
message).

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