Bitcoinlib

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* Increase cache database efficiency and reduce storage size
* Refactor wallet and transaction database
* Remove Python 2 support
* Remove deprecated methods
* Shorter class names: Wallet, WalletTransaction, WalletKey
* Add method to retrieve input values for transactions
* Fix various bugs in Service, Wallet, Mnemonic and Transaction classes

PLEASE NOTE: It is not possible to update database from version <0.4.x to 0.5.0.
You need the updatedb.py script to copy masterkeys and recreate wallets and transactions.

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* Fix errors in Blockstream and Litecoinblockexplorer
* Increase cache efficiency

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* Fix logging, cache and database issues
* Fix several bitcoind noode issues
* Fix issues with Block object
* Fix issues with Chainso, Blocksmurfer, Blockcypher and Blockchair
* Disable cache when database problems occur
* Add Quantity class to represent very large/small numbers

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* Create Block object to parse, serialize and extract information
* Add getblock and getblock method to service providers
* Add caching for blocks
* Fix various issues with service providers
* Fix conversion issues, and increase speed by avoiding unnecessary conversions
* Add Dogecoin

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* Add support for new bitcoinlib-based Blocksmurfer provider
* Fix issues with Service class and service providers
* Fix various Bcoin issues
* Fix antique P2PK transactions
* Improve database and caching performance
* Fix issues with incorrect balance, number of txs or utoxs in cache
* Add spending transaction information in transaction outputs
* Add getblock method

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* Simplify logging and configuration
* Use pathlib module instead of os.path
* Allow to use mysql or postgresql for cache database
* Fix some issues from service providers