Deprecate support for MCMD_BeaconInfoReq/MCMD_BeaconTimingAns

[terrillmoore]

Class B support prior to 1.0.3 was pretty much broken. In 1.0.3, they finally corrected things. At that point, they deprecated MCMD_BeaconTimingReq and MCMD_BeaconTimingAns (LMIC: old names MCMD_BCNI_REQ and MCMD_BCNI_ANS.)

The code is not deleted, but now you must #define ENABLE_MCMD_BeaconTimingAns instead of #define DISABLE_MCMD_BCNI_ANS.

[terrillmoore]

Need to rename to ENABLE_MCMD_BeaconTimingReq and make sure that the code isn't sending BeaconTimingReq when this option is enabled.

[terrillmoore]

The 1.0.2 spec for some reason did not use symmetric names. They are BeaconInfoReq and BeaconTimingAns. The control option should still be named ENABLE_MCMD_BeaconInfoReq, and it should control both the request and the answer parsing. Somewhat academic as Class B still doesn't work in LMIC as far as I can tell.