WIP: Landing switch#1

Open

SimonWilks wants to merge 3 commits intomasterfrom

Commits on Sep 29, 2015

Extend the landing detector to support pressure switches.
Simon Wilks
committed

Commits on Sep 30, 2015

Remove attempted switch fault detection. Needs more work to be reliable enough.
Simon Wilks
committed

Commits on Oct 1, 2015

Still look for some movement when using a switch only landing trigger.
Simon Wilks
committed