Unofficial 1.3.5

Pure python replacement for shapely, so 2d to 3d now work everywhere out of the box
Clean up autoboolean
2d to 3d better wall mesh generation
2d to 3d re-use Reference point
2d Boolean, buffer, simplify and offset operations
Allow custom holes and walls
Window support for straight holes
Fence rail extended to build safety fences for road
Fix for presets thumbs