cansniffer: increase resolution for timeout values

cansniffer: increase resolution for timeout values

As requested by Felix Seitz the timeout for screen updates should be
configurable to values smaller than 100ms. Marc Kleine-Budde provided the
original patch to increase the resolution of the timing relevant variables.

The rotating animation was replaced by a rolling screen update counter.
Additionally the CAN-ID is now printed in the same ASCII hex representation
as the CAN data.

Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>