Update position of font in CreatureRepresentation

Now font lies in the middle of creatures.
Fixed creature constructor in tests
Fixed WorldScreen imp. after IWorld change
Assets have World feedback tiles now
Fix of feedback tiles in BattleScreen

After change in assets.
Position parameter in new SquareMapObject.

Given position gives a Vector with the same value.
world_feedback_tileset.png
Merge branch 'master' of https://github.com/iamhj/HEROES