Adding paragraphs to the Introduction

[Gulix]

In addition to the generic paragraphs of the Introduction (Credits, Description, Movie Night, ...), custom paragraphs, with custom titles, should be available.

[Gulix]

The Description field is now a unique field, which can be filled with titles and paragraphs.

# This is a title
With a paragraph
And a second one
# A second Title
And a new paragraph

A classic field will be :

The Description of the Playset
# Movie Night
List of movies
# Advices
Some advices