Initial work warning-log

Initial work on a telemetry screen to show the (latest) warnings
received from mavlink.
Fixed a problem with the merge

Fixed a compile problem with latest merge. Need to remember to restart
arduino-ide after merges...
Add possibility to disable sensors

Added the possibility to disable the response to some of the sensor
requests.
Disable status-reports for some messages

Disabled status reports for some messages like "Calibrating barometer"
and "GROUND START".
Don't send custom_mode until we know

Try to minimize the number of faulty mode-reports at powerup.
Merge pull request #8 from chsw/master

Pull latest  from chsw/MavLink_FrSkySPort