* Make TransactionOutputEstimatedSerializedSize public
* Update the mempool interface
* Refactor the mempool to the new design
* refactor txselection and blocktemplatebuilder to the new design
* Update the mining manager
* Update the MiningManager factory
* mempool fix requested changed
* [NOD-1461] Change the external api interface to not having anything besides DomainTransactions and DomainBlocks.
* [NOD-1462] Move external api types to a separate package.
* [NOD-1462] Clarify which model we're using in miningmanager.
* [NOD-1462] Extract coinbase data to its own struct.
* [NOD-1462] Add a comment above CoinbaseData.
* [NOD-1462] Fix the comment above CoinbaseData.
* [NOD-1460] Move the miningmanager interfaces into its model package.
* [NOD-1460] Decouple miningmanager model from appmessage.
* [NOD-1460] Decouple miningmanager model from util.
* [NOD-1460] Make miningmanager implementation structs unexported.
