Replace wg_tag with wg_packet

I'll be the first to admit (but not the first to complain) about the
wg_tag situation. It made it very difficult to manage mbufs (that may be
reallocated with functions such as m_pullup). It was also not clear
where allocation was occuring. This also gets rid of the ring buffers in
wg_softc, which added no performance in this situation. They also used
memory unnecessarily and increased the complexity.

I also used this opportunity to get rid of the confusing t_mbuf/t_done
situation and revert to a more understandable UNCRYPTED/CRYPTED/DEAD
packet state. I don't believe there were any issues with the old style,
but to improve readability is always a welcome addition.

With these changes we can start encrypting packets in place (rather than
copying to a new mbuf), which should increase performance. This also
simplifies length calculations by using m_* functions and reading the
pkthdr length.

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