document symbols numbering as in toc

[nolanking90]

Fix #910
Created new command variants for \contentline and \numberline, and added section_numbers to aux doc data struct.
Now, uses the numbering from the table of contents to number sections in the documents symbols list.
This PR changes the expected output of the document symbol unit test, so the test is updated as well.

\documentclass{article}

\begin{document}

\section{First Section}\label{asec:outer} % 1 Section
	\begin{equation}\label{eq:myEQ}
		1 + 1 = 2
	\end{equation}

	\subsection{Subsection}{First Subsection} % 1.1 Subsection

\section{Another Section} % 2 Section'
	\subsection{Dummy} % 2.1 Dummy
	\subsection*{Subsection'}\label{sec:inner} % Subsection'

\end{document}

produces the following document symbols

main.tex|5 col 24| [Module] 1 First Section
main.tex|6 col 18| [Constant] Equation (1)
main.tex|10 col 2| [Module] 1.1 Subsection
main.tex|12 col 1| [Module] 2 Another Section
main.tex|13 col 2| [Module] 2.1 Dummy
main.tex|14 col 27| [Module] Subsection'

[pfoerster]

Thanks!