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Use shaders to render hundreds of thousands of samples with a responsive UI (#673)

* ENH/WIP: Use shaders for large datasets

This allows emperor to render 100,000 samples and still be responsive

* ENH: Cleanup _fastInit

* ENH: Add a TODO, should be fixed in this branch

* ENH/API: Make the view object more capable

* ENH: Cleanup the view source

* ENH/DOC: Add docstrings for the attributes

* TST: Add tests for point point clouds

* STY: Fix stylistic issues

* BUG: Fix axes tab for large datasets

* BUG: Make radius determination part of the view

* TST: Add test for getGeometryFactor

* ENH: Increase the circle's size

* ENH: Fix raycasting

* DOC: Add description of getGeometryFactor

* ENH: Add documentation for usesPointCloud

* BUG: Fix quaternion rotation for clouds

* ENH: Add error for jackknifed plots

* STY: Add some cleanup

* DOC: Fix typo

Addresses comments by @wasade.

       ___------__
 |\__-- /\       _-
 |/    __      -
 //\  /  \    /__
 |  o|  0|__     --_        Gotta go fast! 🔥
 \\____-- __ \   ___-
 (@@    __/  / /_
    -_____---   --_
     //  \ \\   ___-
   //|\__/  \\  \
   \_-\_____/  \-\
        // \\--\|   -Han J. Lee-
   ____//  ||_
  /_____\ /___\
______________________
Modified from:
https://www.asciiart.eu/video-games/sonic-the-hedgehog

* ENH: Improve raycaster's tolerance

* BUG: Fix animations for point clouds

* STY: Fix JS style

* ENH: Disable saving as SVG/PNG and add message

For large datasets we can't save to svg nor to png, these options are
now disabled and a message is shown "(disabled for large datasets)".

Suggested by @antgonza

* DOC: Improve message

* ENH: Re-enable PNG rasterization

Grab the drawn buffer from the DOM element and save it to a PNG file.

HT: @josenavas 🎩

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