Offline Maps: Allow custom build settings overrides

ArduPilot: Add Follow mode to Rover

Add SimpleROV-5 frame for Sub

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