Add QUrl::ParsingMode to the component setters in QUrl

Add QUrl::ParsingMode to the component setters in QUrl

This allows one to instruct QUrl to ignore the percent-encodings and
interpret the data exactly as provided. This is useful in certain
use-cases where the data comes from a non-URL context.

The strict-mode checking of the components is not implemented
yet. Currently, the behaviour is equal to that of TolerantMode.

Discussed-on: http://lists.qt-project.org/pipermail/development/2012-May/003811.html
Change-Id: Ia5abe045a8ce7f9b50cbce3b5a7e3735e068d03a
Reviewed-by: Lars Knoll <lars.knoll@nokia.com>
Reviewed-by: Shane Kearns <shane.kearns@accenture.com>