How to visualize trace file.

Item Summary
Name	Type	Multiplicity	Description
order	property int	[0,1]
selector	container TraceSelectorType	[0,-1]	Any of these selectors may match.
visualization	container TraceVisualizationType	[0,1]	How a traced operation is to be visualized.

Items
- order
  
  Flags: RAM,runtime
  
  Multiplicity: [0,1]
- selector
  
  Flags: RAM,runtime
  
  Multiplicity: [0,-1]
  
  Any of these selectors may match. (TODO reconsider)
- visualization
  
  Flags: RAM,runtime
  
  Multiplicity: [0,1]
  
  How a traced operation is to be visualized.