Quick parser for pulling out clock and timestamp.

We parse telemtry blocks to get the feed aggregator's
timestamp and station indication, then pull the
corrsponding spacecraft clock (SCLK) value out of
the frame when it's available.

For continuous telemetry the clock seems to increment
once per frame.
Add copyright and license.
Don't print frames for which there's no actual clock output.
Wrap frame data in a class.