v0.4.0

This release brings some internal code cleanups and some enhancements:

• radio wave model framework is now object oriented, making enhancing it easy
• a new simple HF and UHF model has been added. The HF model has a simple skywave propagation model, so with that you can now talk over the horizon. Output power determines range then but don't expect realistic range numbers yet (i think it goes too far). UHF is LOS like VHF, but with more limited range.
• mumble 1.4.0 can check if a new version for a plugin is available. This has been implemented, the updater now checks the github tags page for updates.

As with the previous versions, you need the lua mumble module compiled for the server side, as well as a build of mumble development branch 1.4.0 with plugin support. I precompiled that for debian bullseye/sid, see 0.3.0 release: https://github.com/hbeni/fgcom-mumble/releases/download/v.0.3.0/lua-mumble_and_mumble-1.4_pluginFramework-linux.tar.gz