New fixes and improvements

Hi all,

i've been working on some fixes and tweaks, here they are:

Screen rendering mode now can be switched. Press F3 to switch form "Normal mode", that is the default one, and the old "GameMaker mode". This second one was the one that forced resolution on some PCs, but i've kept it in case..

The downward sword slash was hard to pull out in some conditions: now it's fixed and easy to do.

Minor tweaks on the tutorial

The Tiresias speech associated with the normal bow incorrectly talked about the flame bow, i've corrected it.

Fledermaus.