Linux support

[fenhl]

Would be nice to include a version of the GUI compiled for Linux in the releases. Needs the following addition to .cargo/config.toml:

[target.x86_64-unknown-linux-gnu]
rustflags = ["-C", "target-feature=+crt-static"]

Once the GUI runs, auto-tracking on Project64 (via Wine) and RetroArch should work for free. BizHawk runs on Linux but the N64 plugin doesn't work.

Open questions:

• How to distribute the Linux binary? Just upload it? Maybe host a package source for apt?
• How should updates work? (Integration with package managers would probably be best, but then all the different package managers have to be supported.)

[fenhl]

Rather than using the +crt-static feature, which didn't work the last time I tried this, it might make sense to target x86_64-unknown-linux-musl.