* view->filter->sky: Q3 shader based skies (skyParms keyword)
* 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* superseded Patch Inspector by extended Surface Inspector functionality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
* texBro folders tree: sort it case insensitively
* "Built-In Group Dialog" layout option, embeds entity, textures etc dialog on the right of main window
* 2D view new brush creation: do not stumble on one dimenstion resizing, when the other is 0
* 2D view new brush creation: preserve brush start world coordinate, when viewpoint is changed in the process
