- Basic simulator with 3 devices
- Can be driven via a UDP interface
- Design allows to drive the simulation via different interface in the future
by using Request/Reply messaging.
- Add new shared subcrate satrs-shared to split off some shared
components not expected to change very often.
- Renmame `satrs-core` to `satrs`. It is expected that sat-rs will remain
the primary crate, so the core information is superfluous, and core also
implies stability, which will not be the case for some time.
