Beem

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* New hive node has been added (https://hived.emre.sh)
* Add option to use a derived WIF from coldcard hardware wallet to derive a new account password
* beempy passwordgen and beempy importaccount have now a new option import-coldcard
* beempy passwordgen handles now password generation and import, whereas beempy keygen handles BIP39 related key generation.
* refactoring and better unit testing

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* Fix history item with index 0 for https://api.hive.blog

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* Adapt account history on api changes and fixes issue 267
* Speed up history call, when limit is below 1000
* Improve unit tests for account history
* Fix estimate_virtual_op_num, when get_account_history returns an empty entry for an index
* Implement _get_operation_filter and use filter operations in history and history_reverse on the https://api.hive.blog api node

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* Fixed a bug when using skip_account_check=True
* Refactor code in Account
* Add more unit tests

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* Fix bug in bytes representation of an Amount which prevents sending certain amounts (e.g. 8.19 HIVE)
* Added unit tests to check if 8.190 is correctly working

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* Add diff_match_patch dependency again, as the difflib implementation does not work