added point cloud layer
Added PointCloudLayer object definition
added PointCloudLayerOptions
created ogPointCloudLayer class
added function ogCreatePointCloudLayer
name change: ogAddPointCloudLayer

changed name to be more consistent with other layers.
added streamable point cloud demo
fixed copy&paste error...
added method AddPointCloudLayer
added method RemovePointCloudLayer
add/remove point cloud layer
using compiled version