Slightly simplified billboards
Navlights: blink in a preset pattern when landing gear is down
More flexible light pattern
Preset light patterns for ships and landing pads
Light scaling
Add lights to placeholder_ground
Remove Loader::CreateLight
Navlights: serialization
hoop station upgrade from @ImTheFish
add specular maps
optimise textures (optipng -o9 and advpng -z4)
remove alpha channels from specular maps and re-compress
very simple door animation for orbital stations
Polish translation.
data/modules/BreakdownServicing/Languages.lua
data/ui/Languages.lua
Update data/lang/Russian.txt
Downscale natrix to the 30m range
update collision mesh
Merge remote-tracking branch 'origin/master' into navlights

Conflicts:
	src/Ship.cpp
	src/Ship.h
four bays for hoop station
Merge branch 'hoop-station-upgrade'