428-issue update SigningTransactionPeriod to 300 blocks, and a few fixes for bitcoin chain client

Heimdallrequested to merge
428-issue into master

Closes #428 (closed) This PR fix the following few issues

  1. Save UTXO into the block scanner level db, instead of spin up it's own
  2. Fix issues that find out during TSS test
  3. Update SigningTransactionPeriod to 300 blocks
Edited by Heimdall

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