Custom Properties Animation to Curves UE

Thanks so much SAM-tak for they works -> https://github.com/xavier150/Blender-For-UnrealEngine-Addons/pull/175

Export custom properties animation to Curves UE readable

You need use "UE Standard" to have the custom properties recognized in Unreal Engine

In 'Preferences > Add-ons > Import-Export: Beldner for Unreal' Panel,

If check this 'Export custom properties' check box, add-on export custom properties animation to curve data that UE readable.

Custom properties that can be recognized as Curve Value in UE need to be set on Bone, not Object.