Support for Pickling

The following PyQt4 classes may be pickled.

• QByteArray
• QChar
• QColor
• QDate
• QDateTime
• QKeySequence
• QLatin1Char
• QLatin1String
• QLine
• QLineF
• QMatrix
• QPoint
• QPointF
• QPolygon
• QRect
• QRectF
• QSize
• QSizeF
• QString
• QTime

Also all named enums (QtCore.Qt.Key for example) may be pickled.