Distinguish unpiped from piped wikilinks

Enhancements:

• Distinguish unpiped from piped wikilinks, text.markdown.notes.wiki-link.unpiped from text.markdown.notes.wiki-link.piped. For piped, allow different color and formatting for support.function.text.markdown.notes.wiki-link.title.first vs .second - tx @mrgutkun. Re: #102.

Diff:

https://github.com/kortina/vscode-markdown-notes/compare/3c586476..3c4661c5