Enhancement: Jump counters?

#### Issue details
Not sure if this could be done easily based on telemetry from an aircraft, but could we get feedback to the GCS about the state of jump counter(s) in the flight plan?

We will ofter set up endurance tests by having the aircraft loop around with a do_jump command for a huge amount of time, and counting loops manually often leads to miscounting loops. Having feedback from the aircraft about where its jump counter(s) are would be awesome. We do sometimes use multiple counters for complex plans, so ideally you could view multiple counters.

No files, tests, or entry points are named. Start by locating how the GCS receives aircraft telemetry and represents do_jump commands in a flight plan; define how multiple jump counters should be displayed and verify the result during a looping endurance mission.

Written by the indexing model from the issue text.