Bitcoinlib

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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

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* Cache transactions and address info retrieved from Service providers
* Increase efficiency when updating transactions
* Fix path issues in Windows
* Disable Python 3.4 support, add 3.8 tests
* Fix several transaction update issues

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* Enable database backup
* Fix documentation build
* Review all documentation
* Add Jupyter manual
* Add various unittests
* Fix issues with service providers
* Fix many minor bugs

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* Add support for bcoin client
* Add support for mysql and postgresql databases
* Add blockstream, bitaps and smartbit provider
* Improve scan and update transaction methods
* Remove obsolete providers
* Fix bitcoind and litecoind issues
* Fix various provider issues