Hooked in feature packs to show in super search using tags in the FP manifests
Added some keywords to manifests for super search
[CL 2526727 by bruce nesbit in Main branch]
#nonjira
#branch UE4
Added ImagePadding to FSearchBoxStyle which allows custom padding around the various icons in the search box
Added Style to SuperSearchBox as TOptional (because it's in it's own module, it's easier to add "optional" args this way), and modified SearchBox to also use the same method, which means we reduce duplicate instances of the default search box style around the code.
[CL 2394951 by Andrew Brown 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]
