altosui: Use timeouts to recover from broken packet links.

altosui: Use timeouts to recover from broken packet links.

This puts timeouts every place the system reads from the packet link
and aborts the in-progress operation if it takes more than a second to
get a response.

Also mixed in here are persistent igniter status displays for the
ejection testing UI.

Signed-off-by: Keith Packard <keithp@keithp.com>