add graticules and time scrolling

This lets you break away from following the head of the
capture by mouse-scrolling inside the viewport.

The "scrollbar" at the bottom shows the viewport in the
context of the whole capture.

Capture continues unaffected by this, and you can rejoin
following the head of the capture by scrolling back to it.

Eventually the capture ringbuffer will be exhausted, by
default after 120s and what you're looking at overwritten.

You can use the Run checkbox at the top to halt capture to
avoid that, if you captured something interesting.

Signed-off-by: Andy Green <andy.green@linaro.org>

0 files changed, 0 insertions, 0 deletions