Let the Surface workbench appear and try to create a Bezier surface

Modifications for:
 - let the surface workbench appear
 - use only one Surface menu and toolbar instead of two separate ones
 - create a Bezier surface using 2..4 Bezier curves (does not work yet)
 - use enums for fill type

Signed-off-by: balazs-bamer <kolaloka@freemail.hu>