20221027-QtTest1

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* superseded Patch Inspector by extended Surface Inspector functionality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