[LaTeX] Improve LaTeX

[deathaxe]

This PR is introduced to track changes on develop/latex branch, which is intented to be used to collect and review various improvements implemented by @ngc92 without creating too much noise on master branch.

The idea is to base all work/refactoring on this branch and merge them into this one using PRs.

Once a milestone with reasonable changes is hit, we can merge it to master branch as "Rewrite LaTeX" or whatever name/category is suitable.

The starting point is #3546 but with the opportunity to use this repo as working area instead of my "private" one.