Bitcoinlib

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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

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* Issues with unconfirmed transactions
* Delete wallet transactions
* Fix key balance update issues
* Fix various issues
* Add unittests

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* Locktime updates
* BIP38 updates
* Random change outputs
* Random input / output order
* SQLCipher support
* Avoid dust utxos

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* Added new Value class to represent cryptocurrency values
* Accept Value class in Wallet and Transaction methods
* Fix some service, database and cache issues