[sugar] Develop debugger controls

[Andrew Clunis]

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Hey Marco,

I'm starting to think about where Develop's debugger controls will go.
Odd as it sounds, the frame might actually be a good place.  It's easily
accessible, and always-on-top.  The buttons I'd probably need are:

Play
Pause (maybe the same as Play?)
Step Over
Next
A sugar menu-dropdown (what are they called?) containing the current
stack (only when paused, of course)

And possibly a button to go back to Develop to look at data structures
visually, like DDD.

Naturally, these would only be present when debugging an activity.

Thoughts?

- --
Regards,
Andrew Clunis

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