Bitcoin tnx#71

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Macrosrider wants to merge 19 commits intoskycoin:developfrom

Macrosrider:bitcoin_tnx

Commits on Aug 19, 2020

Transferred existed code and fixed all errors during build and test
Macrosrider
committed

Commits on Sep 1, 2020

Added proper structures in order to build transaction more easily
Macrosrider
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Commits on Oct 15, 2020

Added proper structures to work with BTC transactions
Macrosrider
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Added proper functions and constants to work with BTC transactions
Macrosrider
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Added functions for BTC signing and implemented correct BTC signing algo
Macrosrider
committed

Commits on Oct 20, 2020

Fixed issue with wrong format of currency amount, added SIGHASH_ALL flag
Macrosrider
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Commits on Nov 12, 2020

Commits on Nov 16, 2020

Fixed issue with signature length in responce
Macrosrider
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Commits on Dec 8, 2020

Fixed issue with failing signing tests
Macrosrider
committed

Commits on Dec 18, 2020

Added some standard regressive tests for BTC transaction signing
Macrosrider
committed