GCS: confirm failsafe is working during input wizard

Some receivers have a failsafe mode that do things like hold
the throttle at a constant setting. In this situation, the flight
controller cannot tell that the pilot is no longer in control.

This is an extremely unsafe configuration and should not be
facilitated by the wizard. This adds a step that requires the
user to verify that failsafe detection is working reliably.
GCS InputWizard: do not change FlightStatus to period

There is no need to set FlightStatus to periodic. OnChange
is more reliable for things that rarely change. Just need to
make sure the other objects don't clobber FlightStatus when
that is needed.
GCS Input Wizard: remove old logo from transmitter
GCS Failsafe Configuration: disable fast updates of other objects

These fast updates clobbered the ones we wanted
GCS Input Wizard: transparent background around transmitter

No need for the gray background. This looks cleaner.
GCS Input: allow bypassing failsafe detection (not recommended)

Some receivers (e.g. 9x) do not have the ability to configure
failsafe. This is extremely dangerous to use with a multirotor
as they can fly away once this happens. This commit adds strong
warnings against this configuration, but allows people to skip
the failsafe check.
Merge pull request #1255 from peabody124/failsafe_input

GCS: confirm failsafe is working during input wizard