b5b0ec503c
- Rewrite of the existing yes/no dialog to support more button options. Now it
can be used with OK/Cancel buttons or as a simple message box with OK or
Cancel. This message box that can be used to show error messages with a
new action "warn" or for critical panics when continuing would be dangerous
("BX_FATAL"). These features are not implemented yet.
- Partial rewrite of the button handling code (e.g. new method add_button()).
- some malloc/free to new/delete changes.