FX.1 BimCraft: Move works on stairs (and ramps, railings, roof planes, free-standing devices, pictures, paths)

Reported from the browser edition of BimCraft 0.8.1: with an L-shaped stair with winders selected, Build > Move did nothing and a drag panned the plan. Move, Align and Distribute only knew walls, floors, columns and placed library items. Now a stair moves by a vector (its steps, rails and stairwell are made again; one undo step; selecting any of its parts counts as the stair). The same fix covers ramps, railings, roof planes, free-standing electrical devices, pictures and paths / driveways / patios. Devices on a wall, foundations, floors, ceilings, rooms, countertops, framing, dormers and doors / windows follow their parent and are not moved on their own. Copy is refused for these (as for placed items). No grips on a selected stair: Move is the way. Tests: bin/test-bimcraft.mjs --modify (stair, ramp, railing, roof plane, device); pictures and paths wired but not yet exercised by a test. Site masses and terrain are not movable.