Missing MAC commands

[novag]

Missing:

• NewChannel (Add support for channel masks and adding channels #4)
• DlChannel
• DutyCycle (Low priority)
• TxParam (Low priority)

Missing (uncritical, since initiated by the end device):

• LinkCheck
• DeviceTime

Partly implemented (missing required functionality):

• LinkADR (Channel mask Add support for channel masks and adding channels #4 and redundancy missing)
• RxParamSetup (Setting RX2 channel missing)

Partly implemented (uncritical, missing optional functionality):

• DevStatus - Relative battery level missing