Progress report 4

There's been quite some progress since the previous preview video. The most notable changes are:
* new technical/gameplay mechanics have been added;
* the FORTRESS zone map has been finished;
* the text reader (used for the documentation, the intro and the outro) has been rewritten to be faster and show text with 0.5 lines spacing.

This video shows a little bit of all that and, additionally, a test that has been made for the PARK zone: the idea was to create a map based on the graphics of the first QUOD INIT EXIT game, but it turned out to be bad both graphically and from a gameplay point of view.