Discussion: https://forum.flaxengine.com/t/flax-engine-update-1-2-6223/425

Changelog:

• Add warnings when cooking collision with empty mesh data
• Add CookingData for C# editor to extend the cooking process
• Add build preset and target names to access for Game Cooker extending
• Add option to change order of items in Content View
• Add support for creating custom BoxVolume type in C#
• Add creating Scene Graph nodes for actors inheriting from some shared custom types
• Fix compiling C#-only game scripts without native platform tools installed
• Fix editor crash on startup when Rider 2021.1 is installed
• Fix CharacterController minimum size checks to prevent crashes if values are too small
• Fix startup failure on older CPUs that don't support invariant TSC
• Fix potential runtime error from locale::global
• Fix creating prefab in Editor from selection in Prefab window
• Fix undo for missing actor children and scripts when doing Convert action
• Fix crash when spawning C# object that inherits from abstract C++ class
• Fix crash when cooking collision data for multi-mesh models
• Fix missing mesh collider vertices transformation for navmesh building
• Fix crash on startup when 2 Rider installations are detected