Reintroduces options selection for the Mac.

For everything except the Vic-20, anyway. That has a somewhat outdated notion of what an options panel should be, corresponding to the work yet to do on its analyser.

Machines/DynamicMachine.hpp

@@ -29,6 +29,18 @@ struct DynamicMachine {
 	virtual JoystickMachine::Machine *joystick_machine() = 0;
 	virtual KeyboardMachine::Machine *keyboard_machine() = 0;
 	virtual Configurable::Device *configurable_device() = 0;
+
+	/*!
+		Provides a raw pointer to the underlying machine if and only if this dynamic machine really is
+		only a single machine.
+
+		Very unsafe. Very temporary.
+
+		TODO: eliminate in favour of introspection for machine-specific inputs. This is here temporarily
+		only to permit continuity of certain features in the Mac port that have not yet made their way
+		to the SDL/console port.
+	*/
+	virtual void *raw_pointer() = 0;
 };
 
 }