Normals are now calculated in thread.
Replaced Bresenham's algorithm with Xiaolin Wu's for anti-aliased lines (in nm drawing)
Fixed bug: Edge of normalmap now correctly drawn on all sides.
Added shape dragging, refined controls.
Right-click will now drop a dragged shape.
Shaped can now be dragged using snap-to-grid
Added key to remove selected shape
Shapes can now be moved up and down in the layers.
Edited help menu. Added profil function to normalmap rendering.