new PoC script to generate a thumbnail png of the entire map
timing test for different compression methods

Plus a new script to generate a block of random squares
change require header so it works properly on the server
change cell id separator. Think the colon looks better
move to the new quick format for loading block data
test framework set up for the thumbnail generation
serve minimap files through the webserver

also move the minimap file out to its own class
mini map shows correct data, but doesn't update when moving
update the mini map when the user scrolls
store thumbnails in their own directory, and ignore it