Initial Complex mission item support

Instruments not updating correctly.

Raise min Qt version to 5.5+

Hiding Auto Connect check box until it gets actually implemented down…

Hopefully fixes crash Lorenz is seeing.

I removed some needed headers from a top level file which then causes a
ripple effect downstream

Offline Map Caching

Altitude properties are visually distinct

Removed 3D Mouse support

* MavLink/master:
  Remove dead parameter cache code
  Include type arg in method prototype
  New parameter cache loading spec
  Run DO_LAND_START as normal standaloneCoordinate
  Change MAV_CMD_DO_LAND_START to standaloneCoordinate
  Better error output
  Don't use home for last altitude
  Add gradient

Fixing QmlObjectListModel usage bug

Plan: Add Gradient to bottom item status

New parameter cache loading spec

Land start is now standalone coordinate

* MavLink/master: (59 commits)
  Fix incorrect method name
  Add vehicles to Plan view
  Flight lines different color than waypoint lines
  In progress indicator for vehicle sync
  Land items default to 0 altitude
  Keep ParameterLoader on first seen dedicated link
  Keep ParameterLoader on first seen dedicated link
  Only save to eeprom when value changes
  Remove 3D Mouse Support
  Don't auto-select on mobile
  Fix ArduPlane FLTMODE_CH usage
  Don't try to use QCoreApplication::arguments before an app is created
  Move the buglist override to as early as possible, include switches for specific rendering backends on windows
  Add Intel PowerVR based GPUs to the naughty list
  Remove unused code
  PX4: Rename auto loiter to auto pause
  Update param meta data for PX4
  Don't check driver version on Intel GMA graphics adapters
  Thumbtack alternate instrument panel
  Vehicle.battery FactGroup
  ...

Download Speed Tweaks (+2 squashed commits)
Squashed commits:
[ff0ef7e] Cleanup (remove OpenStreetMap)
[370fa1d] Done (+25 squashed commits)
Squashed commits:
[9f3368f] Need to check how many instances of MapEngine are active.
[d557eac] Download Optimization
[392f50a] Almost there.
Trying to optimize download.
[a49d1d2] Settings
[a94be97] Mostly there. Needs to finish options and map thumbnail.
[38d5a0b] Downloading tiles and deleting sets
[81101b9] More UI Work
[c597d4b] Downloading tiles
[a815e35] Get rid of OpenMaps
[7e177ea] More reorg
[fa6b671] Start handling create tile set
Fix signal order when creating fetch tile task
[2a31f4d] Refactoring
[268b906] Renaming things
[947d66e] Fix resource load error.
[19e2de8] Adding MapBox
[c73e627] Preparing download
[87bbf22] UI Tweaks
[3c32a86] A lot of UI code done.
[ece8ce2] Starting to deal with tiles
[7f387bc] Save tile set
[f66f343] Adding more code
[4de3418] Working
[f0cc25d] Done for the night.
[2d1d86e] Added SQL database for holding out own tile cache.
[d405a87] Convert to camel case as this has been driving me nuts.

Conflicts:
	src/FactSystem/ParameterLoader.cc

 - Request list of all parameters, expecting device to lead each component with _HASH_CHECK cache value
 - Test for hash collision, if so our cache is valid and respond with _HASH_CHECK to stop listing
 - Else: let listing continue as normal to get updated param values
 - Store each cache by systemID + componentID

For #2586

Fix incorrect method name

Bunch 'o Changes

Keep ParameterLoader on first seen dedicated link