Flat Water Data Provider

FlatWaterDataProvider can be used for all flat water systems.
It can even be used with wavy water systems if the waves have 0 amplitude to improve performance (sometimes drastically as the water heights are always queried with wavy water system, even if there are no waves).

• Attach FlatWaterDataProvider to the GameObject representing the water.
• WaterObjects will now float at the water transform.y position.