Remove Unused Code, Remove Hatch for Buildings with unknown Usage

- Unused code or code which is commented out was removed.
- Buildings with unknown use or no mapped use will not have a
  rendered hatch to be easier recognized in field.
New Style without any Hatch

This new hatchless style is very similar to the style with hatch.
Because it has no hatch, you can easier read the usage and house number
if any.