[GREENFOOT-438] Move debug-log and other auxiliary files
Make Greenfoot more self-contained: Move the debug log and config files from ~/Library into the Greenfoot.app folder (on Mac).
(Although need to consider how this affects update experience: custom config would get lost between updates \- is that good or bad?)
Apple now recommends keeping all files together (so that simple app deletion cleans up).
- Issue type: Task
- Priority: Low