Adjustable paths/plots height, hills and cliffs, detachable objects and more

[list] [*] Adjustable height for paths and plots e.g. wall, market, forest or land plot [*] Land plots have two edge variants: Slope or cliff [*] Detachable objects from paths/plots e.g. trees from a forest or cottages on a road [*] New tower variants: Square, hexagonal, round each straw, wood, tiles [*] New variants for light sources [*] Smoke as object & Smoke Color in Environment [*] Note that no additional commercial license is required, added under "About" [*] Bugs fixed and minor things adjusted [/list]