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]
#UE-3724 - LIVE: BP: If a comment box is created inside of another larger comment box the smaller box is no longer editable
#Branch UE4
#Proj UnrealEd, GraphEditor
#info this issue came about after recent changes to slate resulted in OnHitTest no longer being called by design. This changelist seeks to eliminate the requirement for this by correctly sorting the comments in arrangedchildren.
codereview Nick.Atamas
[CL 2377331 by Ben Cosh in Main branch]
* Moved Slate.h into SlateBasics.h and began shifting less commonly used headers into SlateExtras.h.
* Slate.h now simply includes SlateBasics.h and SlateExtras.h.
* Slate.h includes a deprecated warning now to indicate that SlateBasics.h + specific includes should be used instead.
* Moved dozens of inlined functions using Slate widgets into .cpp files to avoid header dependencies.
* All code samples now include SlateBasics.h and SlateExtras.h so future shifts will not break most those projects, but not trigger the deprecation warning of including Slate.h.
#BUN
[CL 2329610 by Wes Hunt in Main branch]
