Complete map rewrite (port to leafletjs)

(based on work by Crosire http://www.dayzcc.tk/)

These maps are now supported but I've only really tested Chernarus to any great degree.
chernarus lingor takistan panthera2 fallujah namalsk tavi

Created/updated some thumbnails for 1.7.5. For now all of the Raw and Cooked food items use the same original meat icons. Boiled water in bottle is the same as a normal full water bottle.

This is a huge rewrite so don't be too shocked to find bugs. Report them when you find them.