Add compression #55

Currently, data posted to L1 is linearly serialized, full addresses and full 8 byte values for balances and nonces. By changing the Serialize and Deserialize calls add compression to this, you can choose any one you want:

• simply gzip the data
• add variable length integers, something akin you can find in the Bitcoin Protocol
• instead of storing the full addresses, assign each address to a unique integer and identify accounts with such IDs

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