Sculpt: Add rake option to snake-hook

This allows for dragging out shapes that rotate to follow the cursor motion.

Values over 1 can be set for 'interesting' artistic effects.

release/scripts/startup/bl_ui/space_view3d_toolbar.py

@@ -951,6 +951,12 @@ class VIEW3D_PT_tools_brush(Panel, View3DPaintPanel):
                 row = col.row(align=True)
                 row.prop(brush, "crease_pinch_factor", slider=True, text="Pinch")
 
+            # rake_factor
+            if capabilities.has_rake_factor:
+                col.separator()
+                row = col.row(align=True)
+                row.prop(brush, "rake_factor", slider=True)
+
             # use_original_normal and sculpt_plane
             if capabilities.has_sculpt_plane:
                 col.separator()