Naming Improvements

[LayneHaber]

Motivation

Naming is confusing, now is a good time to clean up anything we think has been problematic.

Considerations

• Transaction nomenclature is annoying -- users often get confused if a transactionId is the same as a transactionHash
• Sending* / Receiving* should be renamed to reflect Multihop #761

Key Questions

• What is a better option for Transaction?
• Is local / adopted / canonical a clear nomenclature for the contracts? We need to make sure the distinction between these terms is clear and easily understood.

Potential Solutions

• Sending* / Receiving* should go to Origin / Destination with Intermediary representing hops
• Transaction could be CrosschainTransaction? Job? Not sure.

[LayneHaber]

Implemented in #881