Firmware Install, All Options should sort versions from higher to lower

The Firmware Install, All Options screen allows users to install older versions of AP onto their autopilots. They most often want to pick a recent stable version so it would be best if the "Version Type" drop-down was formatted to reflect this.

So Stable versions would appear first and with higher numbers appearing higher in the list. Next would be Beta and then finally Dev. We should also consider removing the "Official" entry completely because it doesn't offer any versions that aren't already available as "Stable".


FYI @tridge