New protocol decoder: Jitter

libsigrokdecode has had support for the jitter protocol decoder for a while now (it is already shipped with the recently-released libsigrokdecode 0.3.1), but this hasn't been officially announced yet, so here goes.

The decoder allows you to retrieve the timing jitter between two digital signals. This can be useful for a number of things, e.g. finding jitter/delay between a sender and receiver (be it wired or over some form of wireless communication), or for debugging your firmware interrupt setup by checking how much jitter you have between multiple consecutive invocations of the interrupt handler that should in theory always be equally spaced.

We also added a small test-case in our sigrok-test repository so we can ensure that the PD works fine (and continues to do so upon changes).

This protocol decoder has been contributed by Sebastien Bourdelin, thanks a lot!