!A KeyPress
!R added Animator class

New Animator class added.
Mario can be placed with left mouse click. He will disappear when right
mouse is pressed.
!R #2 grid-borders are part of the highlightable grid now
!R #1 problem identified

Problem only occurs, when viewport size is bigger than actual screen
size

For now, I just draw the viewport smaller.
Merge remote-tracking branch 'origin/RenderingBranch'