Script fixes and render additions

fixed priority hierarchy so rules will work correctly.
24/7 establishments to be indicated
Water stations renderable using a related icon
Points hierarchy fixes and new renderables

Embedded establishments on building polygons are made to show up with
correct icons.
24/7 establishments now indicated
Water stations now has a more fitted icon
Polygon script update to show additional elements

Swimming pools and Natural Springs now renderable
Community centers now renderable as structures
Update readme on recent changes