Added recently uploaded German speed signals (lf7)

Added 16 lf7 speed signals for speeds from 10 to 200 km/h in 10 km/h intervals, except for three yet to be drawn icons (20 km/h, 50 km/h, 80 km/h).
Merge pull request #49 from bigbug21/patch-2

Added recently uploaded German speed signals (lf7)