Change TxVoteSet into a commit scheme without mutex

[andrecronje]

No description provided.

[andrecronje]

Committed transactions are removed from the mempool. These transactions should still be included in the blocks however as validated transactions.

Blocks won't require the full transaction and can thus increase storage space dramatically.

Committed transactions should not be replayed by the block execution and should be saved in a secondary space.

Committed transactions do not need to store the full commit message and transaction, this can be looked up via the txstore.

Process flow should be;

Commit
Remove from mempool
Remove from txvotepool
Add to finalizedpool
Consensus & Block modified to add finalized pool but not to relay / play the transactions