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Optimize _glfwInitJoysticks on OS X.
This function used to enumerate all devices and capture all properties of every device into a dictionary. This takes 180 ms on a MacBook Pro without external devices and 280 ms with an external keyboard/mouse attached. Since we're only interested in a few properties, we can just get them one by one - this reduces the time to <1 ms. Note that we still use the dictionary to get the joystick elements. For unknown reason this is required to get all axes/buttons - without doing this we don't get any joystick elements in addJoystickElement. Closes #332.
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