#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]
