Texsoup

\item`s are now parsed correctly:
- includes correctly tex parsing for all item contents (e.g., environments, text, commands etc.)
- respects strange item parsing rules: preceding whitespace can be arbitrarily long, but once content starts, there can only be one line break between content (not 2 successive line breaks)
- (biggest change) adds a new line to the end of each `\item`

- fixed command argument parsing (ate up strange characters at random)

- Bug fixes related to parsing and tokenization errors
- More robust behavior for `item` and environments such as `$$`, `verbatim` etc.

* New tokenizer allows for preservation of whitespace
* More robust to line breaks in command arguments, math environments
* immune to mumbo jumbo in verbatim, lstlisting etc.
* Small bug fixes
* Accommodates more edge cases, involve command parsing

Users can now modify the parse tree in-place with add, remove, replace functionality.

basic search and navigation functionality