TODO change message.
Added wxWidgets to the build. Not sure how to properly get the dependencies into the repository, but I can change that later.
Well, it's not pretty, but it now displays _something_, which is much better than I hoped. Committing not because it is clean, but because it works.
Cleaned up from the previous commit. Lots of documentation and reorganization. Also, shaders are now loaded from file.
Renamed shaders.
Added dragging capability and dummy piece models.
Bug: don't take addresses of temporaries.
Added Board.setup().
Made dummy piece models reflect the piece type with their hue.