* 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]
- Removed UI for Built-In Stats. Martin didn't like the feature but I've left the code in just in case people miss it.
- Removed useless bar at the bottom of the stats window.
- Hackily canceled some unnessessary compilaton when opening the editor.
[CL 2272297 by Simon Tovey in Main branch]
#ttp 338544 - EDITOR: Update Notifications "Show Log" to "Show Output Log"
#branch UE4
#change Changed hyperlink text to be more specific in individual instances of FNotificationInfo objects.
#reviewedby Chris.Wood
[CL 2108221 by Richard TalbotWatkin in Main branch]
