Implements the argument parser, the manager logic and the DB client
methods.
Encapsulates the DbClient connection under the _db attribute on the
manager.
Adds verbose option to enable ORM increased logging.
Move all BL to the manager. The ArgParser now only parses the CLI
arguments and creates a command which contains which command was run. In
turn, this information is passed to the manager, which will run the
appropriate business logic.
This will make it easier to add new options, separating the parsing of
the CLI options from the implementation of the logic. It also simplifies
any future effort in adding a different input (e.g. GUI).
Warning: some function were commented out, this is only a tracer bullet.
A bank had an offset on the date of the transactions...
It also passes the interal Bank type to the converter, to access it's
additional options before converting.
Python's single dispatch can´t use type aliases and lists of classes.
All converters now work on a class, and lists need to be generated
inplace and call the converter for each item.
Adds the bank class both to the DB schema and the common types.
