fix: gracefully shutdown on CTRL+C and SIGTERM on Linux #273
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When running on Linux, listen for SIGTERM in addition to CTRL+C.
I am not incredibly competent with Rust and Linux is my daily driver, so please double-check my changes. Regardless, this should behave relatively the same on Linux and Windows, past the "Failed to install CTRL+C signal handler" error not appearing on Linux if redlib fails to install that signal handler.
This also fixes #205.