Original implementation from midelic.
Added RX number support.
Fixed (almost) SmartPort over SPI.
Fixed indentation.
Somewhat working telemetry.
Fixed SmartPort.
Work on SmartPort.
Work on SmartPort.
Working version without RX ringbuffer.
Na, stuff it, ringbuffer is better.
Fixed build.
Make sure we don't lose packets.
Made MSP over SmartPort over SPI work.
Moved processing of incoming telemetry into 'handleTelemetry'.
Improved telemetry buffering.
Make sure telemetry polling is happening.
Some cleanups.
Make telemetry wait if MSP is pemding.
Made MSP over SmartPort work.
Fixes after rebase.
Combined FrSky D and FrSky X.
Combined FrSky D and FrSky X.
Merged D and X.
