added icons from bigbug21
added missing Zs3
Merge pull request #1 from ubahnverleih/railway-signals

Merge branch 'ubahnverleih-master'
Add DE-EBO railway signals:
- all Lf6 from 110 to 200 km/h
- all Lf7 from 110 to 200 km/h
- all Zs3 from 100 to 160 km/h
- Zs3 for 70 and 80 km/h

Icons by bigbug21