Robocode: 1.5.1 fixes a security issue

- Fixed security flaw with the Event Dispatch Thread, where robots could use the SwingUtilities.invokeLater() for running any code they should like to.
- Thanks goes to John Cleland who reported this security flaw and provided some very good examples of robot that could do some nasty cheats.

Robocode 1.5 has been released

Compared to the 1.5 Beta, the following was added.

New features:
- Added the Robot Cache Cleaner tool created by Aaron Rotenberg (aka AaronR).
- Used for cleaning the cache files for the robots, which is very useful with the RoboRumble client, where most problems can be solved by cleaning the robot cache files.
- This tool is activation by selecting "Clean Robot Cache" in the Options menu or by running the tool from a command line (standing in the robocode home directory):

java -cp ./libs/robocode.jar;./libs/cachecleaner.jar ar.robocode.cachecleaner.CacheCleaner 

Changes:
- Improved the output of the command line usage of Robocode when called from the command line with the -? or -help option.