APIView - Compare revisions using simple tree comparison

[praveenkuttappan]

Currently new tree token model compares two revisions using same method that identifies modified tree segments. We don't need to identify modified segments when comparing two revisions to check if there are same or not. It just requires a DFS comparison of two tree tokens to make it faster.

[maririos]

@praveenkuttappan would you say there is more work to be done here?

[maririos]

Was done as part of the major re design work on the tree token parser