Legavos: First complete system integration test

Technically this is now a robot that could theoretically apply to compete in the Mech Warfare competition: it's got a FPV camera, it's got an airsoft gun, it's got a leg-based locomotion. It'd probably do pretty poorly at the moment, it's not up to standard with the other entries, but I'm happy with it anyway :) One issue is visible in this video, and that is that the gait machine crashed at around 0:28 (and was then automatically restarted). It's done that a few times now, so I'll need to add some more logging/telemetry to it and find out why. Yes, I also need to reduce the CPU load while walking - I'm missing far to many of my timing targets (the "missed loops" telemetry value)