Unstructured2D canvas example.
Takes unstructured 2D locations, with corresponding 1 or 2 dimensional
scalar "values". Plots the values looked up from colormaps and
interpolated between the locations.
Clean up:
Edited the header and module docstring.
Removed unused timer and keypress events.
Changed the example data to better showcase what it does.
Modified to satisfy make flake.
autopep8
Corrected the header
Revert "Screenshot class that saves the first frame of a canvas. Did not manage to make it work with app.process_events() without running the app.run()."

This reverts commit 4ef3dd316c1046843757f4dbc1dce22aa584f003.
Add the correct file