New animation for main character

We finally got the animation for the hero.
However this includes a couple of problems.

1. Right now the hero walks to the clicked object, without caring
   where it is positioned. It will eventually stop on top of the clicked
   object, which looks funny but is simply wrong.

2. I observed a scaling bug, when the character changes the z-level.

3. Currently the selection of the tileset to use, while moving is based
   on a simple x-way-to-go <-> y-way-to-go comparison.
   This is wrong in some situations, and needs to be fixed.

Whoever has the time to fix it, please go for it, i'm currently stuck
with scene 5.