Keyboard navigation

[CtrlSpice]

Allow for keyboard navigation through trace summaries in the sidebar and spans in the waterfall view.

[jmorrell]

Suggestion for keyboard shortcuts:

left / right arrow - switch between traces, go up and down the trace list up / down arrow - switch between spans, go up and down the span list ctrl + L - clear history R - refresh

Bonus:

? - pops up a little modal guide to keyboard shortcuts. Try this in github

[jmorrell]

Extra bonus, vim-like shortcuts:

j - down span k - up span h - up a trace l - down a trace