Multicast-expert

Fixed
- Fix the type annotation for McastRxSocket.settimeout() parameter.

Changed
- Replace `blocking` arg to McastRxSocket with `timeout`, which allows you to set an integer timeout in the constructor. The old argument is still supported but is marked as legacy.

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Fixed
- Fix some mypy errors that were visible for users of the library.

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Fixed
- Fix IPv6 McastRxSocket being broken on Linux when multiple interfaces were used (need to open an OS socket for each interface ip-mcast ip permutation)

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Added
- An McastRxSocket can now listen on multiple interface IPs at once via passing a list of interface addresses to the new `iface_ips` parameter. The old `iface_ip` parameter is retained for compatibility.
- If no interface IPs are specified, McastRxSocket now listens on all non-loopback interfaces instead of just the default gateway. This should provide more intuitive default behavior for applications where the interface for receiving isn't known.
- Type annotations now applied to everything, library passes mypy in strict mode.
- py.typed file now provided so that mypy can see type annotations provided by multicast_expert in your own projects.


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Fixed
- Another hotfix for a typo in v1.1.0

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Fixed
- Hotfix for a missing import in v1.1.0. Forgot to run unit tests one last time before uploading to pypi 🤦‍♂️

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