Give each `Element` a serial number, which identifies it uniquely. The serial number is assigned by the `Element::new` constructor.
Because disallows potentially unsafe global state (at least without explicit `unsafe` blocks), the next serial number is stored in a thread-safe static atomic variable (`assembly::NEXT_ELEMENT_SERIAL`), as suggested in [this StackOverflow answer](https://stackoverflow.com/a/32936288). Since the overhead for keeping track of memory ordering should be minimal, we're using the strongest available ordering: [sequentially consistent](https://marabos.nl/atomics/memory-ordering.html#seqcst).
Resolves#20.
Co-authored-by: Aaron Fenyes <aaron.fenyes@fareycircles.ooo>
Reviewed-on: #22
Co-authored-by: Vectornaut <vectornaut@nobody@nowhere.net>
Co-committed-by: Vectornaut <vectornaut@nobody@nowhere.net>
