[sugar] System Tray Icons

[Benjamin M. Schwartz]

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I was interested in writing a clock tray icon, so I attempted to
understand how the battery tray icon works.  After reading all the
relevant code, I have concluded:

1. Sugar does not support dynamically generated icons, beyond the
application of colors and badges
2. The Battery tray icon works by choosing one of 15 different statically
generated icons
3. It is not possible to implement a clock icon using this framework.

I would like to find out if I have misunderstood the code, and how we
should proceed here.  In particular, I would ask: why can't we simply make
each device an arbitrary ToolbarItem?

- --Ben
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