Don't draw the entire world on a giant surface.

Breaks the minimap!
Who wants to walk in circles? I do!

ModDict only works for [], not get()/set()
Remove redundant 'Map' dict.

Add 'explored' field to Cell instead, use RealMap for everything.
Prevent loonies from causing an int overflow by travelling millions of tiles
Merge branch 'master' into bigtiles

See what it looks like with new broken scaling.