github repo for 4th edition of my Java AI book

As of right now, this new github repo mostly contains the code from the 3rd edition of my book but as I re-write the book, I'll also be updating my code. Some of this Java code really needs a rewrite: many of the examples from the first edition were written in 1998 - a long time ago! I have reworked the code with each new edition. The code examples are licensed under the LGPL but I am considering dual licensing them under Apache 2 also.

Any suggestions for code improvements, pull requests, etc. will be appreciated.

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