…lved for the time being

…implemented for a try

…tion

… features that are missing here

…adjuster)

… tests for BlockchainInterfaceClandestine should be made first

…nterfaceClandestine

… responsibility of the estimated gas limit from BchI to Chain

…gas price used for generating hashed transactions

GH-600: Add get_block_number
GH-600: Address PR feedback
GH-585: Experiment with adapting test for platform specific error codes
GH-585: Provide Windows platform specific error code and message
GH-600: Rebase master into branch

* Starts Accountant
* Adds Receivables scan timeout (may become a configuration parameter in another card)
* Stores `max_block_count` in the config table when processing error messages providing a limit
* Adds Max Block Count to configuration response
* Increments CURRENT_SCHEMA_VERSION
* Adds schema migration for `max_block_count`
* Improves blockchain scan error handling and logging