REL_48 (2021-07-01)
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* Minor release
* Implement option to enable/disable the GPX cache
* Implement RainViewer (www.rainviewer.com) as Wx radar source
* Clear issue: 67 - Remove default 1,000 dynamic waypoint limitation
* Clear issue: 68 - Light up the spinner triangles when they are clicked
* Release EFIS v6.9

