first iteration of mission stats calculation (dist and maxTelem)

add survey item distance to mission distance

remove unused calculations from _calcHomeDist

added correct calculation of missionMaxTelemetry when there is a complex item

use speed to compute mission time according to vehicle type

started implementation of hover and cruise distance

corrected typos

added logic

prevent survey from crasing

added checks for vtol

rearrange logic

added primitive check for landing

rearranged checks

new arrangement

added logic for transition

fix for small bugs

add check for mission speed larger than 0

remove already existinh check

reduce code a bit

clean up

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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