Linking the start menu to the sound options menu.

- One way linking.  Sound options doesn't have any options and you
cannot navigate back yet.
Adding music volume control

- Doesn't change the volume level
- creates the control to mange variable between 0-1.
Adding sound effects UI to select volume

- Doesn't control volume simply UI enhancements
- refactoring to push code to RangeSelector control
- adding indicator to show which option is active
Adding back navigation from options menu to start menu
Refactored state menu to use LinkButtons.
Refactoring options scene selection to use linkbutton active
Adding volume control for sound effects

- Volume doesn't work yet since the instance isn't scoped.  Need to
find a better way to control volume.
Adding realtime sound control from menu

- Control music as it is playing
- Control sound effect volume with sample.
Adding loading menu

- Adding basic loading menu (very incomplete)
- Adding ability to start music in the first level
- Refactoring how sound and sprite library are loaded.
Moving drawing variables to central location
Various changes

- increasing goodguys speed
- moving more ui variables to centra location.