#jira UE-8109 - The favorites list for levels displays a max of ten levels, but you are still given the option to add more
#change Changed favorites menu to not have an upper limit. Favorites now organized so the most recently added/opened is at the head of the list. Only the first five favorite levels are displayed on the main menu, the others are on a submenu.
[CL 2418402 by Richard TalbotWatkin 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]
