Fix : COGAngle indicator was shown everytime, fix isCOGAngleOK

- NorthUp becomes NoseUp and is disable by default
- Changes on SVG to make them with the same diameter as the CompassDiag
- Change the order of the indicator layouts

- Remove HomeHeading / COG / HeadingToNext
- Add setting AdditionalIndicatorsCompass that group the previous
  settings

- Add setting for Heading to Next WP and Nort Up lock
- Add check for vehicle for every indicator to avoid showig them while
  no vehicle

Fix MSVC 2015 "fatal error C1060: compiler is out of heap space"

Make Internet test optional.

Disable preflight checklist if vehicle is armed.

Photo idle

Update QGCComboBox.qml

Update to the QGCComboBox to use a textRole in the case where it's availble.

Some small theme colour fixes.

custom-example: Fix gimbal view and an edge case for thermal options

QGC Custom theme - visual fixes

Redirect CentOS docs to devguide

Fix gimbal indicator display

Fix gimbal indicator so that angle values match the markers
Select thermal mode on thermal menu selection

Custom vehicle selector now affected by theme change. Cosnistent with other actrive elements

Drawer now affected by theme, consistent with the rest of the active elements.

TODO: Add hover for desktop

Ligther Button, Primary and Hover + New alert color

Added gimbal pitch SVGs for indoors and outdoors theme