libgsmhr1 TFO: require BFI=0 and SID=0 for homing In order for a received frame to be recognized as DHF, we need not only the correct bit pattern, but also BFI=0 and SID=0. The BFI=0 requirement should be obvious, while the SID=0 requirement is needed only for HR codec. With FR and EFR, SID classification comes from the payload bits and no separate check is needed - but in HR we get an out-of-band SID ternary flag. When SID=1, no payload bits are used at all; when SID=2, we use only the first 33 bits of the payload. Therefore, it is proper to conditionalize DHF acceptance on SID=0. We already implemented this logic in the just finished full decoder; now bring TFO code into agreement.

All Themyscira GSM codec libraries (currently libgsmefr, libgsmfr2 and libtwamr)
use Semantic Versioning, as described at <https://semver.org/>.  In the present
source release package, the semantic versions of the included libraries are as
follows:

libgsmefr version 1.2.0
libgsmfr2 version 2.1.0
libtwamr  version 1.0.0