Added new drawing brushes to DrawCanvas class

Draw triangles, stars and squares.
Possible fix to shapesprays

Added missing line, which adds created points to the shapes
pointcollection.
Modified shapesprays

Changed thickness and point coordinates.
Modified shapesprays

Changed magnifyvalue, thickness and points
Modified star shapespray

Changed point values.
Merge branch 'shapespray' into controls
Added shape sprays to buttons