Fix for Rust 1.67.0 and latest Mumble APIs

[citelao]

Today, this crate does not compile. This change updates the crate to compile on modern Rust, plus adds some missing APIs and updates the README for clarity.

What changed?

• Updated README with more complete build instructions.
• Updated outdated dependencies.
• Removed outdated compiler flags.
• Updated libs to handle more modern bindgen output.
• Updated enum generation to match previous names (after Mumble made changes to their naming).
• Add missing mute APIs.

How tested?

• Compiles my working plugin

TODO

• Support 1.2 version
• Support more idiomatic enum variant names.
• Fully update README, including document known good Mumble versions
• Add example, for easier testing

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Appendix

Rust version info (via rustup show):

stable-x86_64-pc-windows-msvc (default)
rustc 1.67.0 (fc594f156 2023-01-24)

[Andicraft]

Please 🙏 Would love to see this updated.

[citelao]

@Andicraft, for now you can pull from my fork if you'd like to start working. I don't have any plans to continue contributing to the PR at this time, and I haven't heard anything from @Dessix.

I'm new to Rust, so I'd welcome any contributions to this PR.

[Dessix]

My apologies for the delay- It seems that submission of a draft PR doesn't actually trigger a notification to maintainers. @citelao as I've evidently fallen behind on this, I'd gladly offer maintainer permissions on the repository.

[Dessix]

The unchecked unwraps seem to kill the point of the Option change- I'd prefer they be at least standard unwraps unless the performance benefit is significant, and these FFI calls shouldn't be running in a very tight loop as it stands, so the impact should be negligible. Beyond that, this looks fine.