Tweaking MapType and MapCenter icons
Added Zoom Plus/Minus icons to be used for maps
Added PiP icon for the upcoming Picture-in-Picture functionality

Updated Google Maps API Version
Updated User Agent used for map tile requests

Also:
- Remove unused code

Use import QGroundControl 1.0 to get to it

Also understand the concept of missions which cannot be edited

This was done to support both PX4 and APM flight stack with same code

Previous code was horribly wrong.

- Also added new adjustMavlinkMessage support

Too complicated supporting both modes as editor becomes more complex

Remove nigh load/save

Also much other cleanup/change

This allows for testing issues found on high dpi screen without needing
a high dpi screen. it does this by doubling the font sizes.

These use OpenGL implementation which prevented moving to ANGLE
support. Since they are rarely used they are being remove instead of
being upgrade.

These use OpenGL implementation which prevented moving to ANGLE
support. Since they are rarely used they are being remove instead of
being upgrade.

Plus more overall ui work