[x] Styling - Leaflet's default marker and popup styles are used
[x] Formatting - Lots of formatting information is already processed by the generator, but the viewer does not use it yet. Whitespace is currently handled incorrectly.
[x] Grouping - Multiple signs with the same X/Z coordinate may exist at different Y coordinates. They must be grouped to a single marker.
[x] Sign URL - Include currently opened sign in URL
This is still work-in-progress. To implement:Currently all signs are displayedLeaflet's default marker and popup styles are usedLots of formatting information is already processed by the generator, but the viewer does not use it yet. Whitespace is currently handled incorrectly.Multiple signs with the same X/Z coordinate may exist at different Y coordinates. They must be grouped to a single marker.Closes #35