This time to handle correctly updating plan/fly view when plan changes

Retry in all the right/possible places. Don’t freak out about things
coming in unknown sequences.

Plus new unit tests

# Conflicts:
#	src/MissionManager/MissionManagerTest.cc

Also additional major Mission usability changes

- override by vehicle type
- override by firmware type

Also turn on MavlinkLogTest

Too unstable for CI at the moment

- Fixed found bugs in MissionManager

- Fixed bugs found to unit test

- fix bugs found by test
- Implemented Mock mission item protocol in