* 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]
TTP# 333732 - EDITOR: The new project wizard falls back to using TP_TemplateName if it can't find a matching translation, even if an English translation is available
ReviewedBy Andrew.Rodham, Max.Preussner
[CL 2065413 by Jamie Dale in Main branch]