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]
Instead of using the (cached) state, we cache the brush to use to display the state and only hit the state cache when state changes.
Also updated Execute() calls to providers to only do relative-path conversions if the path is already relative.
Added SourceControlHelpers::AbsoluteFilenames to aid conversion.
TTP# 335201 - ContentBrowser: Improve idle performance
#codereview Andrew.Brown
[CL 2075346 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]
#ttp 331349 Editor: Source Control: Some issues with creating new source control provider
#change Fixed up conflation of enum with bool in if() blocks when calling Execute().
#fix Fixed QueueStatusUpdate not checking for NULL source control state.
reviewed by Andrew.Brown
[CL 2049714 by Thomas Sarkanen in Main branch]
#ttp 331118 LIVE: Editor: Source Control: Engine content is displayed in Check In dialog
#add Added a CanAdd() function to the source control state API & implemented this for both providers.
#change Changed asset context menu to restrict operations that can be performed based on the new information provided by CanAdd().
#fix Fixed a terrible bug in the SVN provider where only the first batch of 50 files would have their status returned correctly.
reviewed by Andrew.Brown
[CL 2043041 by Thomas Sarkanen in Main branch]
