* 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]
#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]
TTP# 334923 - EDITOR: Perforce Integration (Move -> Delete + Add instead of Integrate)
New API: Added ISourceControlRevision::GetBranchSource.
Made sure the P4 and SVN providers perform integrates/copies so that history is maintained across file copies & moves.
Also fixed SCC icons not refreshing sometimes until source control operation has completed.
Added new branch icon.
Fixed date display in history.
This required some fairly nasty fixup to get it all working within the Editor copy code path, but the majority of the changes are in the source control providers.
reviewed by Andrew.Brown
[CL 2095604 by Thomas Sarkanen in Main branch]
To allow for further abstraction & extension using DVCS systems like Git & Mercurial, we expose a new CanCheckIn() function that is used when determing 'modifed' files to check in.
#github https://github.com/EpicGames/UnrealEngine/pull/151
TTP# 335099 - [GitHub] 151 : Add ISourceControlState::CanCheckIn()
reviewed by Max.Preussner
[CL 2073950 by Thomas Sarkanen in Main branch]
Changed the message log direct notify to a custom notification so the icon gets set to something less aggressive (message log uses the 'worst' message on the current log page for the icon).
TTP# 333620 - Editor: Source Control: Error icon displayed when submitting to source control
reviewed by Andrew.Rodham
[CL 2060917 by Thomas Sarkanen in Main branch]
#branch UE4
#proj Editor.SourceControlWindows
#summary The submit files dialog now follows the same style as the rest of the engine.
#change Change the buttons to use the established method of crating uniformly sized buttons.
#reviewedby Chris.Wood
[CL 2053199 by Barnabas McManners in Main branch]
