Add support for ArduRover MockLink

Add FOLLOW flight mode

Better handling of NaN in LOITER_* commands

Work around quirkiness with ArduPilot and LOITER_* NaN handling on heading.

No camera commands for ArduPilot

StructureScanFix: Starting altitude

BUGFIX: When scanning from the top the starting altitude shall be equal to the structure altitude.

Disable Logging

Wildcard connect to all Hex boards

Hack around ArduPilot problems with unsupported NaN in Loiter commands

Hack around ArduPilot problems with unsupported NaN in Loiter commands

Wildcard connect to all Hex boards

Grouped logging options within General Settings

Removing overzealous exclusions.

Multiple Video Streams

ArduCopter 3.7 CH#_OPT -> RC#_OPTION name change

Copter 3.7 CH#_OPT -> RC#_OPTION name change

Display FW custom version in the summary page

Make sure video streaming is running before accessing it.

Full ChibiOS bootloader support, plus autoconnect for ChibiOS builds