20221027-QtTest1

[Garux]

menus...

* view->filter->sky: Q3 shader based skies (skyParms keyword)

misc...

* render Q3 shader based skyboxes
* refactor textureTags GUI, make it toggleable in runtime
* textureTags work right away without scanning of all availbale textures & shaders
* superseded Patch Inspector by extended Surface Inspector functionality
* port editor to Qt framework

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This discussion was created from the release 20221027-QtTest1.