improve German H/V light signals

For Hp0/1/2:
- use "Kompaktschirm" signals
- make lights larger (factor 1.9)
- use Inkscape filter "einfache Unschärfe"

For Vr0/1/2:
- use different raster images sizes
add German Hp semaphore signals

Differences to the versions in railway-signals repository
- no lights
- arrows simplified (thicker and shorter) for low resolution icons
- reduce distance between arrows (Hp2 only)
add German Vr signals (semaphore)

modifications to railway-signals icons:
- Vr1: more orange
- all: Ne2 icon added to differ Vr0 from Sh3 and added Ne2 to Vr1 and
  Vr2 for consistency
- thicker arrows, less space
rename some files

number in PNG file names should be the length of the largest side
remove repeater light from the Vr0 icons
Merge branch 'master' into h-v-signals-better

Conflicts:
	styles/icons/de-vr2-semaphore.svg
Merge pull request #70 from Nakaner/h-v-signals-better

improve German H/V light signals