TODO: Updated.
Forms: Added GmEntry defined to contain numbers.
TODO: More things to do.
Form UI: Added support for NUMBER entries.
Bank: Banks are Actors.
GActorMenu: Added support for menus supporting application actions.
Opal Bank: Turned into an Actor. Ported forms to the new API.
Opal Accounts: Uniformised Forms with Bank Forms.
App: Moved account creation Actions into the App context.