(WIP) Rudimentary version of Wii IPC determinism.  Ported from my old udpnet branch.

This version always starts from a blank slate NAND.  Might not be complete.

Actually, my comment is not quite accurate; socket results could hypothetically be relayed from the host in either netplay or movies.  As I said elsewhere, a better long-term justification for this feature is to make it easy to avoid accidentally putting random state in movies for TAS and such, while short-term it's useful because such transmission is not implemented yet.  I will fix the comment.