combine partials transactions

[proletesseract]

The wallet is going to break the transaction into multiple parts. In the incoming server we will join these back together and then perform the flattening function to help obscure input and output amount inferrence.

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Elegantt data. What's this?

[proletesseract]

• Filter unspent, grouping by unique identifier
• Confirm we have all the parts before adding it to the currentBatch
• If parts are missing and its older than x blocks, reject the transactions to sender
• Keep track of the partials we are combining so we can reject later if some issue sending
• Update flatten, prepare and process scripts to handle new format.