Complete map rewrite (port to leafletjs)

(based on work by Crosire http://www.dayzcc.tk/)

This is done but github bombs with a 500 error when I try to generate a pull request. It might be due to the commit that deletes the tiles directory, not sure. I'm too tired and too git stupid to figure it out.

Here is my branch: https://github.com/wriley/BlissAdmin/tree/leafport

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.