Arguably sweeping a problem under the rug for now, but NullWidget added by STutorialRoot is apparently causing problems on Linux, so ability to disable UI (per platform) is helpful in the short term.
#codereview Thomas.Sarkanen, Nick.Atamas
[CL 2267004 by Dmitry Rekman in Main branch]
Fixed visibility issues where hyperlinks could not be clicked.
Implemented BP functions for tutorial stage completion etc.
[CL 2264228 by Thomas Sarkanen in Main branch]
NOTE: Old tutorials not deprecated (yet), but widget highlights in old tutorials will stop working with this change!
Added new Blueprintable UEditorTutorial object.
Added suite of widgets and details customizations to display tutorials.
New system is available on command line switch -NewTutorials.
Slate changes:
Tag names are now stored in SWidgets, rather than simply being discarded.
Removed STutorialWrapper in favour of using Tags.
Added Tags to more multibox widgets, so virtually all can now be picked.
Added SWindow::HasOverlay so we dont attempt to add overlays to widows that cannot have them.
[CL 2244216 by Thomas Sarkanen in Main branch]
