The old implementation was hacky and often returned desynchronized
results. This implementation gives a seed to each sync object, and
synchronizes that seed. Also allows for a seed to be saved temporarily
based on position and recycled for multiple calls.
Now when a client joins, it will request the entire 512 byte EEPROM from
the server and refuse to continue until the server replies with the
contents. Then the client will override all reads and writes to the
EEPROM/save file. Thus, a client will never overwrite their local save.
Fixes#21