Sketcher Symmetry/es

Description
Mirrors sketcher geometry in reference to a chosen line or sketch axis.

How to use
Note that no extra symmetry constraint will be added.
 * 1) Select the geometry to be copied, then a line or sketch axis to be used as the symmetry axis.
 * 2) Press the button.
 * 3) The selected geometry will be copied symmetrically to the selected line or sketch axis.