Tutorials browser now always appears on the mainframe. This avoids the browser appearing on small torn-off windows if content is torn off while a tutorial is in progress.
Also fixed crash when opening a browser from a widget that used to be docked to anotehr tab (weak window pointer was invalid at this point).
TTP# 347014 - EDITOR: TUTORIAL: If a tab is undocked while being referenced in the "welcome to the unreal editor" tutorial, there will be two instances of the tutorial text
[CL 2305366 by Thomas Sarkanen in Main branch]
Disabled floating navigation widget (but have not removed it yet).
Built navigation controls into the content widget.
[CL 2299461 by Thomas Sarkanen in Main branch]
Added some tags to several BP nodes (for use by tutorial)
Added provision to open relevant editor for highlighted widget
Added support for highlighting blueprints nodes
#codereview Thomas.Sarkanen
[CL 2254285 by bruce nesbit 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]
