Эмулятор NES на Java.

• Minor speed improvements and code cleanups
• Improved VRC7 Envelopes again with values properly calculated from docs
• Audio output is done in stereo now (though no interface to pan channels)
• Build system changed to Maven
• Framework for unit tests is begun (incl work on headless mode)
• JavaFX UI for the RetroPi is included but not used by default. (It needs more work for desktop use.)