45 degree camera (isometric) now moves properly

Instead of moving on z axis with up/down and on x axis with right/left,
now properly moves up and down, left and right with arrow keys.
Basically up = (-1, 0, 1) = (x, y, z)
Playing around with height and distance detection

Detection of distance from objects directly beneath implemented. Also,
less int variables, more floats. RayCasts and better zoom.