Automatic Data Migration - Phase 1

[NathanWolf]

Phase 1 data migration needs to happen right away- I need it for NetherGate, and I think WinSock needs it for ProtectedDoors, too.

Phase 1 will handle adding new columns to a field. Removing fields should already be "safe", though the new migration code will clean up any removed columns from the data table.

I plan to save a backup table for each migration, just in case.