Added
 + Teleportation functionality when moving outside the grid
 + Changed from text-based to image-based level loader.
 + Added red ghost image.
 + A offset variable to offset the rendering screen to the center of the canvas. Remember to call it everywhere when drawing!

To do:
 + Add more ghost images in different colors in the same file, then it should be easy to choose which ones to draw for the moment.
 + Add a image loading function to TextureLoader class.

Changed:
 + Collisiondetection between level and entity moved to level class.

Urgent todo:
 + Make support for scaling when rendering (the collision detection will not recognize scales as is now)
 + Ghost entity in Pacman (currently it loads the pacman spritesheet)