问题一：
编辑器报错 OmniSharp.MSBuild.ProjectManager
Attempted to update project that is not loaded...
解决步骤如下：
Go to settings. (Code -> Preferences -> Settings on Mac)
Search "omnisharp".
Find the section "Omnisharp: Use Global Mono," and set it to "always."
Find the section "Omnisharp: Path," and click "Edit in settings.json." Change "omnisharp.path" as "omnisharp.path": latest".
Reload the window.
问题二：Unity 代码自动补全
Visual Studio Code 中不能自动对 C# 代码补全，
参考解决方案：https://www.bilibili.com/read/cv9764864
