UE-9699 - Fixing all the places we were setting the asset size to 0 explictly, the new default reasonable size is .1, all asset pickers now just use the default, unless they're the content browser.
#lockdown Matt.Kuhlenschmidt
[CL 2449865 by Matthew Griffin in Main branch]
API break: added new pure virtual ISourceControlProvider::UsesChangelists()
API break: added new pure virtual ISourceControlState::FindHistoryRevision(const FString&)
API break: added new pure virtual ISourceControlRevision::GetRevision()
Implementing a Git provider requires us to be able to display revisions that are not indices as Git revisions are hashes. This updates the relvant code to allow us to display these revisions correctly.
[CL 2411986 by Thomas Sarkanen in Main branch]
UETOOL-213 - Minimize Slate FString -> FText conversion (remove SLATE_TEXT_ATTRIBUTE)
This fixes any editor/engine specific code that was passing text to Slate as FString rather than FText.
[CL 2399803 by Jamie Dale in Main branch]