Full recommended tags support

[Jan0660]

From https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/xmldoc/recommended-tags.

• General Tags used for multiple elements - These tags are the minimum set for any API.
  • [x] \
    : The value of this element is displayed in IntelliSense in Visual Studio.
  • [ ] \: Tags used for members - These tags are used when documenting methods and properties.
  • [x] \
  • [x] \
  • [ ] \
  • [x] \
• Format documentation output - These tags provide formatting directions for tools that generate documentation.
  • [ ] \
  • [ ] \
  • [x] \
  • [x] \
  • [ ] #7
  • [x] \ (should be handled by docfx itself)
  • [ ] \
• Generate links and references - These tags generate links to other documentation.
  • [ ] \
  • [ ] \
  • [ ] cref
  • [ ] href - maybe already is?
• Tags for generic types and methods - These tags are used only on generic types and methods
  • [x] \
  • [ ] \

the compiler and Visual Studio validate the \, \, \, \
, and \ tags.

• [ ] \
• [ ] \
• [ ] \
• [x] \
  (also support \
  with the space just to be sure)
• [ ] \

Soo big task! Waiting for v1.0 😆