swat issue #23421:set base currency

- Throws a notify popup after startup if no base currency. 2 buttons with doWorkspace navigation actions (1 - Yes, use USD" - brings user to USD workspace and 2 - Create New - brings user to new currency workspace). The base currency checkbox is handled automatically in the workspaces.
- If base currency set it cannot be changed
- In future base currency will be *one* of the setup actions to perform as part of a guided setup process for blank databases.