blockchain, aggregator, chaincfg, main, netsync: implement utreexo swiftsync #348
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Since we're moving to a different method for syncing, remove the old caching code completely.
For swiftsync, you must have an aggregator to check that all the utxos marked as spent were indeed spent. We create a helper function to efficiently add and subtract from the aggregator. We can use big.Int but converting [32]byte hashes to big.Int values allocate memory and slow down the ibd.
ttl state Since the ttls are til block 270566, we also add a checkpoint up until that block.
We implement the aggregator and only add the leaf hashes that are still utxos at the end of the ttl state. We don't yet check that the aggregator ends up to 0 after we're finished with the swiftsync part of the ibd.
If we have ttls, it means we're still doing swiftsync part of the ibd which means that we don't perform any deletions. Since we don't perform deletions, there's no need to verify anything.
During the swiftsync part of the ibd, we have no need for the utreexo proofs. The changed code only asks for the leafdatas.
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