[DF-867] Fixed qt4 bug with drag-drop on sceneTree
Merge branch 'development' of https://github.com/dava/dava.framework into development
[DF-1239] TextureBrowser now can be opened only as single instance
Merge branch 'development' of https://github.com/dava/dava.framework into development
Merge branch 'development' of https://github.com/dava/dava.framework into development