Remove references to concrete GUI-building programs. Such references are not necessary not to mention that most of the referred programs have not been maintained for a long time.
List of flags in the CreateButtonSizer sizer was unnecessary, some of the values were not valid flags for the methods and comment descriptions for most values did not make much sense in the given context. The section was therefore removed and the method is mentioned in the newly-added part about wxStdDialogButtonSizer.
Sizer types not mentioned in the overview before were added, the rest of changes was mostly adding @c and such.
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