Vehicle change: All items removed
Vehicle add: Request sync is not already in progress

- Convert mission load/save to it
- Allow parameter load/save on mobile

Plus many load/save fixes

- Load/Save working
- Entry point working

Plus new unit tests

# Conflicts:
#	src/MissionManager/MissionManagerTest.cc

Also additional major Mission usability changes

- override by vehicle type
- override by firmware type

- Fix: Version error message not being displayed
- Correct handling of APM and PX4 files with respect to home position
in first slot
- Emit newItemsFromVehicle signal so editor can fit map viewport on
load from vehicle

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