libtwamr encoder: always emit frame->mode = mode; In the original implementation of amr_encode_frame(), the 'mode' member of the output struct was set to 0xFF if the output frame type is TX_NO_DATA. This design was made to mimic the mode field (16-bit word) being set to 0xFFFF (or -1) in 3GPP test sequence format - but nothing actually depends on this struct member being set in any way, and amr_frame_to_tseq() generates the needed 0xFFFF on its own, based on frame->type being equal to TX_NO_DATA. It is simpler and more efficient to always set frame->mode to the actual encoding mode in amr_encode_frame(), and this new behavior has already been documented in doc/AMR-library-API description in anticipation of the present change.

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 1.1.0
libgsmfr2 version 2.0.0
libtwamr  version 1.0.0