- move balance_claim_evalautor implementation from header
- remove authority check from balance_claim evaluator, added to
other_auths defined by the operation
- this is a major refactor of the code and may have broken some behavior
in the wallet or witness nodes.
- this commit changes the serialization of operations
- the chain_tests pass
- refactor how signatures are stored on the transaction, removing key_id
and extra_signatures maps and replacing with a vector
- verify that each key only signs one time
- update tests to handle stricter policies on signatures
