Maintenance release. Fix build warnings. Update Udev rules.

3.7: Nitrokey Pro v0.14 support. Udev rules update. Stability fixes.

RC. Correct Udev rules, tests, and QMake building

RC. Correct device enumeration. Add null checks for device obj. Incre…

…ase attempt counter for Pro. Tests update.

3.6: LibremKey and FreeBSD support. Extended API.

Pre-v3.6

Storage v0.54 support. Test and documentation update.

Pre-release of v3.5 (3). Compatibility fixes.

Pre-release of v3.5. Storage v0.54. API update. Meson support. Tests …

…update. Documentation update.

Pre-release of v3.5 (2). Version update.