Properties for binding are added.
UI for icons are added
Merge branch 'Sitrus2' into DUI-AddonsTypeUpdateBtns
Binding is done
Merge remote-tracking branch 'remotes/ben/Sitrus' into DUI-AddonsTypeUpdateBtns
LibraryType renamed to ElementType
Converter is renamed to ElementTypeToShorthandConverter
Grid is used instead of DockPanel
Merge pull request #205 from vmoyseenko/DUI-AddonsTypeUpdateBtns

Added right side icons for addon root category