UETOOL-213 - Minimize Slate FString -> FText conversion (remove SLATE_TEXT_ATTRIBUTE)
This fixes any editor/engine specific code that was passing text to Slate as FString rather than FText.
[CL 2399803 by Jamie Dale in Main branch]
Added new blackboard view based on MyBlueprint.
Class viewer can now optionally display "Display Names" for classes (this is used to make the names of blackboard entries more friendly).
SPropertyEditorEditInline now displays the class type icon as well as its name.
Blackboard entry details customization now hides the header for entries, so one level of expansion is no longer necessary.
Removed pointer to 'view' in the blackboard debugger & replaced with delegates where appropriate.
Fixed crash issue also mentioned here: https://github.com/EpicGames/UnrealEngine/pull/212
Added new detail customization used to display only the selected entry in the current blackboard.
Fixed crash when running services with no Blackboard (prevent access of NULL blackboard component).
TTP# 337669 - Behaviour Tree Editor: Integrate Blackboard debugging display with Blackboard Editor
reviewed by Andrew.Brown, Lukasz.Furman
[CL 2113798 by Thomas Sarkanen in Main branch]
