refactor: remove duplicate code when upgrading material (#135)

fix: save materials assets immediately when upgrading via GUI (#127)

project: use com.unity.ide.rider@3.0.31 (#134)

internal: add analytics (#132)

gitignore: ignore Rider project files (#133)

project: update to 2019.4.40f1 (#131)

gitignore: exclude Packages/packages-lock.json (#130)

Updated README.md and README_ja.md

Fixed SD-unitychan prefabs with an unused material slot with each Mesh renderer for improvement of compatibility with Unity Toon Shader converter.

Updated some old UTS2 materials without the _utsVersion value.

Added sample scenes for metaverse outline lighting.

Feature/improved blending of outline color (#109)

Update issue templates

Feature/uts2 legacy 1pass stereo rendering (#108)

Release v.2.0.8 for Legacy pipeline / Bug fix for Issue #82: Fixed a bug that caused the brightness of the outline to change unexpectedly in some VRChat worlds. (#91)