Remove old thread/engine interface
Added option to change the variant.

Enable runtime switching between standard, los alamos, and gardner chess.
Rewritten Matfinder
Removed old main.
Restored full Matfinder.

Remove completely old main.
Restored the options.
Ended refactoring of Matfinder.
Restored full OracleFinder.

Chessfinder should now be all good.
Updated help message.

And added some configuration examples.