Debugger: Do configuration error checking early on.
Add a configuration checking method to the Debugger manager, depending on toolchain, wire it to the engines. Check that in the debugger run controls. Add a convenience method to ICore that shows a warning message with a "Settings" button, pointing the user to a configuration error on a settings page. Remove leftovers of the dumper parser. Acked-by: con <email@example.com>