implement watch & zip logic in Rust

evtc-watch consists of three parts at the moment: watch the files, zip
them up and call ezau to upload them. We can now just do all of those
inside of ezau, which saves us the extra script, makes it more
platform-independent (as notify also works on Windows) and makes
configuration and everything easier, as all the data will be inside of
one program and doesn't need to be passed around.

A flag (or subcommand!) to upload a single file might be added later to
retain the previous behaviour of ezau.

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