theMoveMarker now clears itself properly

Turns out the reason for the problem was theMoveMarker's update method
was not being called. Unfortunately, it now deletes itself before the
player can trigger its jump.
Player now jumps when touching theMoveMarker.

New Defect: Distance's references to x and y values are direct, and
ignore the offset that is used by drawing. They should instead be
targeting the x and y. Should: Make an accessor for the x and y (maybe
posX and posY) that factors in the offsets when checked.