- added alternate constructors `from_serial` and `from_udp` that combine instance creation and connection
- added `__enter__` and `__exit__` methods to allow using in a context manager (`initialize` on entry, `close` connection on exit)

Minor update: new interface functionality (alternate constructors, context managers), but still backwards compatible.
- adds Ping360 example + simulation
Need to interactive rebase to appear after the new files actually exist

Need to overhaul so that it actually works, and is a good example.
- ideally want to use sub-parsers for serial vs udp
- needs to do something meaningful when it runs (although that could just be setting some settings and doing a full revolution or few)

- simplify to use boolean operator short-circuiting
- use super instead of explicit parent class name

Resetting can cause issues with using the sonar again until it's power cycled
Particularly relevant given we currently don't have discovery messages implemented.

Using a dedicated datastructure improves robustness (you can't forget a field, and all payloads have the same fields).
A NamedTuple adds typing (requires Python >= 3.6) and reduces memory usage and attribute access time.

 - separated data-buffer construction into its own method (`from_buffer`)
 - improved primary constructor to allow specifying message data directly