Oxidise

[rerpha]

Convert saluki to rust.

Changes to note:

• listen and consume have been merged, as they were quite similar anyway. README and --help should clarify how to use consume (which is aliased to listen for muscle memory's sake!)
• play has not been carried over as I ran out of time to be able to call this personal development. rewrite play in rust #50 exists to add it when we need to use it again.
• howl is a bit faster than python, though I haven't tried the "cheat" way of only constructing one set of det values but sending them x times a frame.
• have added a dockerfile so you don't actually need rust installed to use saluki.
• I haven't gone mad with unit tests as again I've run out of time (I know I know TDD and so on...)

also note that the CI is currently failing at the time of writing but only because one of the apt mirrors seems to be 404ing? working now

I may also need a hand benchmarking howl plz @Tom-Willemsen