Added nullability annotations and nil defaults. #17
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I added nullability annotations for use in Swift (no more ugly !). I also allowed nil to be used as a default value and in the case of the font names, the default or an unfound font will use the system font (no more crashing in the Interface Builder). Font sizes < 0 revert to the default size, as all values less than 0.0 are not allowed according to the documentation. I had to push some default settings out of the view constructor but I believe this is an acceptable loss: what the default settings are is not important to the user.