SD Unity-chan 3D model data

• upgraded asset for Unity 6000.3
• add "SDunitychanHumanoid_2D.unity" as a sample of 3D as 2D feature
• install ToonShader package automatically if it is not installed
• refactor SpringManager
• add SpringManagerInspector that allows user to init SpringManager
• rearrange Unity-chan materials and textures folder
• delete unused materials and textures
• add UnityChan.Common Runtime and Editor assemblies
• rename "Animations" folder to "Animators"
• disable material import for Unity-chan models

• Upgraded asset for Unity 6000.0
• Support Input System package
• Upgrade Face Animations Selector UI
• Upgrade Body Animations Selector UI
• Use UIToolkit for UI
• Fix Body Animations Transitions (next/prev transitions)
• Add Camera Controller in scenes
• Update readme

ver 1.1.0 release Checked with Unity 2020.3.44f1. Compatible with Unity Toon Shader. To use this data, you need to install Unity Toon Shader from Package Manager, which is installed in Anime Toolbox.

Compatible for Unity5

3D model data for SD Unity-chan.