v0.9 with windows executable

Thanks to early testers from reddit for great feedback, the program should now be easier on the eyes and better in reviewing.

• You can load SGF files and rewind to the start to review while the program analyzes your game in the background!
• Instead of having all coloured dots or none, the default is to show only the last moves for less distraction.
• Lots of bug fixes and improved stability.

In addition I've managed to package the program with PyInstaller to give windows users an easier way to download it, see the attached KaTrain.v0.9.zip file for a stand-alone program. Simply extract the files and double-click KaTrain.exe!