#37 wxPythonContext key support failing

[Mike C. Fletcher]

In many of the tests/demos for OpenGLContext, the
wxPython context doesn't seem to be forwarding
key-presses to the code (GLUT context works fine).

[Mike C. Fletcher]

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wxPython has started requiring a Skip in key-down
event-handlers to generate char events. This is now done in
wxevents.py.