Added the ability for asset type actions to provide an extra overlay layer for their asset thumbnails
UE-7970 - Add small 'play' button to EditorTutorial asset thumbnail
Also cleaned up FAssetThumbnail::MakeThumbnailWidget so that it took a config struct (FAssetThumbnailConfig) rather than 7 or 8 defaulted parameters.
[CL 2419655 by Ben Marsh in Main branch]
The display name, filter string, and tooltips for the property editor (and associated detail customizations) are now stored as FText rather than FString. This allows us to remove SLATE_TEXT_ARGUMENT from the detail customization widgets.
[CL 2372595 by Jamie Dale in Main branch]
Please note that file comments had no purpose in nearly all cases and just added visual clutter. The two files that had meaningful file comments had their comments moved into the corresponding classes. There are still hundreds of file comments left in other files that will be removed over time.
Also cleaned up some random stuff along the way:
- relative paths to public headers within the same module are no longer necessary (automatically discovered by UBT now)
- header guards are deprecated, use #pragma once instead (all compilers support it now)
- space between multiple template brackets is no longer required (all compilers support >> now)
- NULL to nullptr, OVERRIDE to override
- spelling errors, whitespace, line breaks
[CL 2104067 by Max Preussner in Main branch]
Renaming a world also renames it's level blueprint.
Moving a world to a new package also transfers over all of it's lightmaps and shadowmaps.
Redirectors are allowed to UObject* (hard) reference assets in another package, but all other hard references are still disallowed.
Referencing a redirector package in a UStreamingLevel now follows the redirector to the world in the new package.
Packages that lose their worlds now also lose the PKG_ContainsMap flag. Packages that gain a world also gain this flag.
[CL 2073709 by Bob Tellez in Main branch]
