Entity Tween v0.2.0

Added

• GitHub Actions to build the default scene for Win64
• Editor.BuildUtils for building the default scene with GitHub Actions
• Sample: Stress Test

Changed

• Rename buffer element Tween to TweenState
• Rename static class EntityTween to Tween
• Replace assertions with if-else checks to be compatible to Burst

Fixed

• Typo "Crossfade"