Added Support for <seealso /> links

[jperson2000]

Description

This update adds support for <seealso cref=""/> and <seealso href=""/> links for types and members. A new SeeAlsoTag type contains the Cref, Href, and Text for any seealso link encountered.

How Has This Been Tested?

This was tested by adding <seealso /> links to the XML docs for the MyClass test class, and adding a unit test which ensures the links are parsed properly.

Type of Changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation (fix or improvement to the website or code docs)

Checklist

• The PR is submitted to the correct branch (dev).
• My code follows the code style of this project.
• I've added relevant tests.

[jperson2000]

Thanks for the wonderful library, @loxsmoke ! Let me know if you want me to roll back the other whitespace changes; I habitually do a Format Document before saving lol.

[loxsmoke]

Is this using necessary?

[jperson2000]

Good catch! That was taken back out.

[loxsmoke]

Great pull request!
Whitespace changes are OK. Let's keep them.

[mikes-gh]

Be good to add this to the repo README.md