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]
This is more consistent with the other combos, and addresses TTP#347917 - PROJECT BROWSER: Starter Content buttons has a dropdown arrow, but no list.
[CL 2315697 by Andrew Rodham in Main branch]
- Add warning bubble to starter content button when Mobile/Tablet is picked
- Add a fake down arrow to make the button look more interactive
[CL 2310662 by Michael Noland in Main branch]
Also removed tabs from the project browser dialogs when they're not necessary. Fixed up some incorrect icon sizes to work with the new layout.
[CL 2290664 by Andrew Rodham in Main branch]
* Categorized templates into Blueprint/C++ templates and organized them into tabs
* New categories can be specified in the templatedefs.ini file of a template project using a Category tag:
Category=NewCategory
* New category types can be registered with a proper description and icon in code through FGameProjectGenerationModule::RegisterTemplateCategory.
* Added preview images to templates
* Generally tidied the UI
This addresses TTP#321302 - EDITOR: Project Browser: Reduce Thumbnail size of Templates
Reviewed by Matt.Kuhlenschmidt
[CL 2260660 by Andrew Rodham in Main branch]
