Largest-Triangle-Three-Buckets downsampling algorithm package and demo

Initial release of elm-lttb, a package for efficient downsampling of data for plotting purposes. Sveinn Steinarssons algorithm selects points to emphasize the peaks and valleys of the original data.

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Love the demo! :heart_eyes:

I’ve used this algorithm before on an elm plotting project but did the downsampling on the backend. Glad to see this coming to the Elm world! :tada:

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