Changes

All map depended dependent data was moved from '''game_data.sii''' to '''map_data.sii'''. Check '''map_data.sii''' for list of obsolete attributes.

The per-country spawn frequency definition has been improved and simplified. the The '''old file-based (def/country/(country_name)/ai system is now obsolete'''. Instead of creating a new file for each vehicle definition, put all your customized spawn frequencies into a single file '''/def/country/(country_name)/traffic.(mod_name).sii'''.