Debug shared library observables API

This release fixes bugs in the observables API of the shared library. (It also fixes 16-bit floating-point builds, but this does not affect the packaged artifacts.)

Full Changelog: vm6502q.v9.9.7...vm6502q.v9.9.8

sha1sum results:
bfcb8d4947438169d41b2239bd0a23d7cdd41324 libqrack-macosx_14_0_arm64.zip
87531e6d58f1a693f63ab246726c8b31a118781c libqrack-manylinux2014_x86_64.zip
bcb49f1ac34ca02db98e1a81d1e24103637aee73 libqrack-manylinux_2_35_x86_64.zip
911e515a4ef76f8e45ed7003d8ced609205b83e9 libqrack-manylinux_2_39_x86_64.zip
89bf709ebe9de530d620b26192b1c5da0734e2d2 libqrack-win-amd64.zip