Assets Showroom Finish

This update makes the following changes:
- Brings the total exterior colors to seven: cherry red, dark red, canary, radiant blue, street black, graphite and the original color scheme.
- Added new color set asset that enables fast switching to all the new color themes.
- Updated the demo scene to the color set asset.
- For all versions of the vehicle, added colliders to the hood, front bumper, rear bumper and rear tail fin.