Split toxcore into layers.

This allows us to more clearly define interfaces between modules, and have the
linker help us ensure that module boundaries are respected.

The onion/tcp/net_crypto layer is a bit too large. This is due to a cyclic
dependency (onion -> net_crypto -> TCP -> onion). We may or may not want to
break that cycle in the future to allow the onion library to exist on its own
without net_crypto.

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