Update maps for Ground Zero

Merge pull request #336 from Shebuka/separate_floors

Fixes to floor map on Interchange

Added better floor map to Interchange

Merge pull request #334 from Discoded/master

Updated items.en.json

First Factory update

Recreated mines on Lighthouse;

Added css to common for small mines

Mines around Lexas will have a smaller line width and closer pattern

Updated mines around Lexos

Fixed defs group name

Scaled Streets so that 1 map unit (point) corresponds roughly to 1 meter in-game

Updated Streets with expansion

Fixed fallen tree in Shoreline