Node constructors should output a hierarchy that can be used to categorized them

[dtmoodie]

Node constructors should output a vector of enums to categorize the node.
IE
Node

• Data Sink
  -- RTSP server
• Data source
  -- RTSP camera
• Image processing
  -- Sobel filter
• Point Cloud Processing
  -- Mean shift
• Tensor processing
  -- deep neural net
• Data converter
  -- Depth image to point cloud
  -- Point Cloud to depth image