Ensure Lox bridge table persists in case of catastrophic failure

This consists of at least two subtasks:

• Creating a persistent database of the bridge table and spent nonces that can be restored from a previous state
• Adding checks to ensure the Lox bridge table stays in sync with full updates from rdsys (which are sent every 30 minutes)

In order to complete these subtasks, changes to the Lox library will be required to make the structures within the Lox bridge table more robust against failure.