Plus remove unused code

- Look backwards from insert point
- Only pull altitude from _WAYPOINT items
- Only set altitude on _WAYPOINT items

* Holds all the settings for the app
* Allows core plugin to override default values

Also added ui support for multiple complex item types

- Shot Interval in Survey
- Much change to time/distance calc

Conflicts:
	src/MissionManager/GeoFenceController.cc

Includes ability to load params

- GeoFence support comes from plugin
- Circle fence support
- Better param support

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