Increase value of collectibles.
Adjust the expiration rate of collectibles.
Better exception handling during decision-making.
Periodic GC to prevent it from interrupting strategies randomly.
Better place for the GC call.

Removes the performance hit while still avoiding the GC hit for
strategies.
Refactor player survival rewards.

We now only reward when some player dies. And we reward more.
Make the reward algorithm pluggable.
Fix bug that resulted in no worms ever being rewarded.
Open dialog rebembers last dir and show only xml files
Add default report location dirs

 * these locations are tried first time the report is being open, if neither
   of the location exists, "user.dir" will be used
 * next time the dialog opens listing the previous dir, not one of the defaults
Using correct style for swing concurrency - SwingUtilities.invokeLater()
Playground improvements - fixed Y axis; better usage of labels for rendering
Refactored cell rendering in swing app