Add ball rolling sounds

[linojon]

Adding this as a separate issue from the current mechanical sounds one although closely related. See:

• Pull Request https://github.com/freezy/VisualPinball.Engine/pull/453
• Handle Mechanical Sounds https://github.com/freezy/VisualPinball.Engine/issues/449
• Audio and Sound Processing (original discussion) https://github.com/freezy/VisualPinball.Engine/issues/226

Sounds include:

• Ball rolling
• Plastics hit