LibraryView is scrollable now.
Disable the links in the tooltip.
Only one category can be selected.
Merge pull request #2286 from vmoyseenko/DUI-DisableLinksInTooltip

MAGN-4377: Disable the links in the tooltip
Merge pull request #2283 from vmoyseenko/DUI-LibraryScrollable(using-mouse-wheel)

MAGN-4380: The library should be scrollable using middle mouse wheel.
Binding refactored.
Style moved to Expander.
Merge branch 'Sitrus2' into DUI-OnlyOneOpenCategoryAtTime
delete empty row
IsExpanded directly in Expander, style removed.
Merge pull request #2287 from vmoyseenko/DUI-OnlyOneOpenCategoryAtTime

MAGN-4378: Only 1 library category is open at a given time
Merge branch 'Sitrus2' into DUI-IconsForOverriddenMethods
removed unnecessary point