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]
Necessary for using a distributed compiler on OS X. Updated for recent changes that caused more preprocess problems.
#codereview michael.trepka, jack.porter
[CL 2072853 by Mark Satterthwaite in Main branch]
#ttp 331898 EDITOR: Update Perforce SDK to Visual Studio 2013 compatible libraries
#note This a re-submission of the previous CL 2048699 minus the SSL lib changes that were causing problems for people with different SSL-enabled installed programs.
#add Added new Perforce API libraries & includes for version 2014.2.
#remove Deprecated the loading of the P4API.dll - we no longer use this in the Editor (however it must remain as it is used in the build system).
#fix Fixed source control tests to properly create temporary packages.
reviewed by Andrew.Brown
[CL 2049736 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 331898 EDITOR: Update Perforce SDK to Visual Studio 2013 compatible libraries
#ttp 331132 LIVE: Editor: Source Control: Request to support SSL connections to Perforce servers
#add Added new Perforce API libraries & includes for version 2014.2.
#add Added OpenSSL 1.0.1g alongside the new Perforce libs & updated build script to link against them, rather than the stub.
#remove Deprecated the loading of the P4API.dll - we no longer use this in the Editor (however it must remain as it is used in the build system).
#fix Fixed source control tests to properly create temporary packages.
reviewed by Andrew.Brown
[CL 2048699 by Thomas Sarkanen in Main branch]
#proj UE4
#branch UE4
#summary The source control window is now sized 700px wide
#reviewedby Thomas.Sarkanen, Max.Preussner
[CL 2038534 by Jamie Dale in Main branch]
