WIP - adding callsite information and clear functionality to TuneUp

[mjkkirschner]

A small experiment in adding callsite info to tuneup

• add another column to tuneup to display serialized trace data.
• add a button to top level to delete all active trace data.

TODO

• [ ] callsite display should be more useful - base64 encoded is not useful.
• [ ] callsite data should be collapsed by default.
• [ ] tests