Fix justrender API for S57.
Updated S57 to 2.1 git hash 6b2a49417fea040fa60d620aa8e960349e89537a. Fixes resources and cache locations.
Now all goes to .cache folder.
Fix a bug that made the first map change did not trigger the undo button.
Added Changelog from v3.0.0 to v3.0.1.