Shows horizontal/vertical scroll indicators

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

fixing the stats display

enable hide/unhide of vtol and survey stats

adding check for surveying item

setting distance units and check if vtol

add active vehicle

check for valid mission

requested changes

Android done.

Signed-off-by: Tomaz Canabrava <tomaz.canabrava@intel.com>

Signed-off-by: Tomaz Canabrava <tomaz.canabrava@intel.com>

- Load/Save working
- Entry point working

Plus new unit tests

Also additional major Mission usability changes

Add scroll height indicators to Flickable