geosimplify-js polyline simplification library

Based on https://github.com/mourner/simplify-js, geosimplify-js fixes the problem that the simple pythagorean measure used in simplify-js changes size if you simply give it longitude/latitude sequences to simplify.

Used in the QML plugin of Qt Location.

The sources can be found in qt-everywhere-src-5.15.15/qtlocation/src/3rdparty/geosimplify.js.

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 Copyright (c) 2017 Daniel Patterson

geosimplify-js License.

 Qt port of geosimplify.js, https://github.com/mapbox/geosimplify-js

 Copyright (c) 2017, Daniel Patterson
 All rights reserved.

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 permitted provided that the following conditions are met:

    1. Redistributions of source code must retain the above copyright notice, this list of
       conditions and the following disclaimer.

    2. Redistributions in binary form must reproduce the above copyright notice, this list
       of conditions and the following disclaimer in the documentation and/or other materials
       provided with the distribution.

 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
 EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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 Based on simplify-js by Vladimir Agafonkin - http://mourner.github.io/simplify-js/