More context menus needed

There should be more context menus. There are non in 3D editor, form editor and non for editing properties in Navigator.

Navigator menu is already quite crowded, needs to think where to add it. Would be usefull when something needs to be replaced, switched to another type or something new is added to structure. Also some flows could be simplified using context menus.

Identify places and use cases where context menus are needed.