Use INI file for overall map list.

Separate JSON files per-map.
Clean up reorganised map config.
Merge branch 'master' into configtweak
randomish water
Load sign positions and labels from JSON.
Remove non-standard Sign.visiblenotify().

Move behaviour into Sign.update()
blobby trees, for layered rending with oversize tiles
pretty blobby trees, with simple layering
more tree prettyification
More graphics fiddling
Merge pull request #28 from FLHerne/configtweak

Configtweak (By request of FLH)