Link tag support

[Daniel-Knights]

This PR adds support for @link tag parsing, converting identifiers to their full module paths. It respects link text if it exists, if not, it uses the original identifier.

For nested member access, it just links to the root identifier, because finding what kind of member it is and constructing the namepath correctly is a bit more complicated and I don't fully understand how it works.

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Some further notes on nested member access that could be added in a separate issue:

We'd need to know what kind of member it is - instance or static, property or method - and format the namepath accordingly.

To find out what kind of member it is, we could use the AST cached in fileNodes, though, that could cause an issue if the imported file hasn't been cached yet.

Using the default JSDoc template, I found links work with the Identifier#member namepath format for everything except static methods which require Identifier.member:

• module:path/to/module.Identifier#member
  • Instance properties
  • Instance methods
  • Getters/setters
  • Static properties
• module:path/to/module.Identifier.member
  • Static methods

Identifier#member working for static properties contradicts the docs, which says Identifier.member should be used for static members. This could be a bug in JSDoc core, a bug in the default template, or just incorrect documentation, I don't know.

[ahocevar]

This is a great addition, thanks!