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]
TTP# 335070 - Add GUI based way to specify additional non-asset files or paths to package
CookCommandlet now uses the project settings to work out which additional directories it should cook (this removes the need for the editor to pass this information to that UAT via the command line). I've left the COOKDIR option in the UAT/CookCommandlet as, while non of our projects seem to be using it, I'm not comfortable removing it in case any scripts are using it.
CopyBuildToStagingDirectory also uses these project settings to work out which additional directories it should stage when producing the staging manifest (these are split into UFS and non-UFS directories). This allows users to define additional directories in the editor (or directly in the settings file) which will always be staged regardless of how UAT is invoked.
All of these paths are specified in the settings file as relative to the project Content directory, and the editor will enforce this fact when using the directory picker.
Also mirrored the meta-data interface from UField on IPropertyHandle. This takes care of accessing the meta-data from the correct property, even when you're accessing an element inside an array (MattK approved!).
ReviewedBy Thomas.Sarkanen, Robert.Manuszewski, Max.Preussner
[CL 2088172 by Jamie Dale in Main branch]
Automation: Milestone 3 and fixes for milestone 2
-Added new EditorShot command to take editor screenshots
-Made the ExterialTool options use the dierctory picker
-Fixed a bug with the StaticMeshEditor test if the tutorial pops up
-StaticMeshUV test now uses async package loading
-Added a display every Nth screenshot to the screenshot compre tab
-Added support to disable screenshots or request full size ones
-Changed the screenshots so they save to the game directory even if you run the frontend by itself
-Added screenshot support for the load all maps tests
[CL 2071712 by kevin hamilton in Main branch]
