Added a zoom function to the scroll wheel and per-view grids (orthogonal)

|SOURCE|
[OrthographicViewControl]
* When the mouse scroll wheel is actuated, the delta is taken into
  consideration and used to increase or decrease the zoom level (this is
  currently unlimited)
* Added a per-view grid, which does not currently work for the top view
Fixed the grid to have end edges and every 10th edge is highlighted

|SOURCE|
[OrthographicViewControl]
* 1000 grid lines are drawn for both plane directions with each 10th edge being
  highlighted
* Fixed the front view to have the camera in the correct position (-1 instead
  of 1)