Bitcoinlib

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* Improve speed of Key object
* Parse block transactions as dict
* Improve and speedup unittesting
* Speedup large wallet deletion
* Allow use of pycryptodome wallet and make scrypt library optional
* Fix unidecode error in Network

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* Allow to parse blocks with unrecognised transactions
* Improve block and transaction parsing speed
* Improve fee estimates and transaction size calculation
* Fix coveralls
* Various bugfixes and provider issues

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* Add mempool.space provider
* Move unittesting to workflow in Github Actions
* Add support for bech32m addresses
* Test regtest and update providers
* Various bugfixes

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* Fix logging issues
* Add Bitflyer client
* Remove Coinfees client
* Fix various provider and service request issues

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* Issues with bcoin, litcoind, bitcoind provider
* Use correct Bitcoin symbol
* Typos and other small bugfixes

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* Add Script class to parse, create and validate scripts
* Add Stack class and methods for script language
* Use Script class in Transaction, Input, Output, Block and Wallet
* Remove old service providers and fix provider various issues
* Use standardised method names: hex, parse, parse_hex, etc in all classes