Add the ability to export norg files to HTML (#1688)

* Initialzie an HTML parser

Inital commit included begining support for:
- headings
- lists
- TODOs
- paragraphs
- links
- italics
- bold
- subscript
- superscript
- comments
- verbatim
- blockquotes

* Introduce macro handler concept

Then uses macro handler to support:
- code
- comment

* Render escaped characters

* Parse single line and multi line footnote

* Parse inline math

* Parse links

TODO: Implement support for cross-norg-file linking, right now the
workspace path has a temprorary placeholder

* Parse anchor tags

* Fix cross file linking

Cross file linking assumes that the path is `/:workspace/path/to/file`

* Add code comments

* Refactor code for improved readability

* Remove unnecessary param comments

* Fix bug to prevent overusage of paragraph tags

* Implement new method for adding paragraph tags

The tricky part is that paragraph nodes are also used for link content
and list content. This can lead to over usage of paragraph tags for
HTML.

* Fix issue with link description persisting across nodes

* Run stylua formatting

* Revert unitended file changes

* Update core.export.html doc comments

* Escape HTML

* Update logic for adding li tags

This is done so that it can correctly render mulit-line list items. The
only real change to logic is that nested lists will be inlcuded inside
of a given list item (this may or may not be the correct way to handle
nested lists). My limited testing has resulted in HTML that rendered
correctly.

* Ran stylua

* Add support to link to heading with both generic links and heading links

* Add spoiler class for spoilers

* Impelemnt consitent indenting in code blocks

* Add support for link targets

* Modify inline math class

* Fix stateful bug with code blocks

Adds an option to pass in a function into keep_descending. The function
makes it easy to rebuild object so that it doesn't unintentionally
persist.

* Fix escaping bugs and convert inline math to a code tag

Code tag allows it to be rendered in a paragraph.

* Use code tag for verbatim

* Render footnotes at the bottom of the page

* Use hop to generate links

* Use hop except for cross-buffer links

* Clean up hop commit now that issue #1717 should be resolved

* Removing unintentional change due to a bad merge

* Merge private and public link builder tables

* Ran formatter

* Add line that I accidentally deleted

Author: adc613