Classlib: QPenPrinter: Add 'bounds' method

A drawFunc may now simply ask the view for its bounds, and it will
work whether the view is a UserView or a QPenPrinter. Without this,
the function has to check the class of the view, which is poor OOP.
Merge pull request #1235 from jamshark70/topic/QPenPrinterBounds

Classlib: QPenPrinter: Add 'bounds' method