Added the missing pickers to wxSmith

[Cryogen]

Added the following pickers to wxSmith:

wxColourPickerCtrl
wxDirPickerCtrl
wxFilePickerCtrl
wxFontPickerCtrl

I also reorganised the Advanced tab and started adding doxygen file comments, as doxygen can't document code fully without them.
Created against SVN 6283.

Note: Pickers with text controls won't layout properly when the text control is visible unless you use them in a sizer. That's how it's done in the wx sample.

Cheers.


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