travis linux docker infrastructure and ccache

-enable ccache

-until we start running unit tests on android

Fix mode selection coloring

Fix Flight Mode binding loop

Decimal place support + other fixes

Move ParameterLoader override to FirmwarePlugin

Mission home move

Mission drag visuals

They were causing variable scoping conflicts. This in turn caused the
widget to not update. Active property is not needed since the handling
of active/inactive vehicle is handled outside of the control

Wait until parameter load complete for Mission Load

Remove deprecated config option

Mission controller Unit Test

Missing dependencies for video streaming on iOS.

Allows for signal count > 1