REX Go

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* Added support for ARCore. This allows to permanently place your models in the real world.
For a list of supported devices see: https://developers.google.com/ar/discover/#supported_devices
* Added support for three new visualization types: text, linesets, pointlist.
* Added support for vertex colors.
* Coordinate system now according to OpenREX specification: https://github.com/roboticeyes/openrex
* Minor UI improvements.
* Bugfixes.