Adds support to fold the following section tags:
\part\chapter\section\subsection\subsubsection\paragraph\subparagraph
and environment tags:
\begin{...}-\end{...}
Sections Folding
Section headers should not be malformed (e.g. without {}), else folding ranges will not be created.
Environments Folding
Environment declaration commands should be balanced (e.g. no excess \end{}s) and never malformed (e.g. without {...}), else folding ranges will not be created.
Who would ever use MSWord if he got LaTeX...?