Fix build on MinGW

Issue introduced in 87ff0af425656d12c4766a57db60674d63ffa584 .

Change-Id: Ifa9a7bd5af63b1462b4c2cf5e0715962bbcd74b4
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Remove qSort usages from QStringList

QtAlgorithms is getting deprecated,
see http://www.mail-archive.com/development@qt-project.org/msg01603.html

Change-Id: I38d220142d4f5e580503cc10f804e0d16f418cc1
Reviewed-by: Olivier Goffart <ogoffart@woboq.com>
Remove qSort usage from QSettings

QtAlgorithms is getting deprecated,
see http://www.mail-archive.com/development@qt-project.org/msg01603.html

Change-Id: I5aabfd2dd4fa48a4d94407ca444591e9df7b981d
Reviewed-by: Olivier Goffart <ogoffart@woboq.com>
QMetaMethod and QDBusMetaObject: Give public access to signal methods

To be consistent with signals which are public since Qt5.

Change-Id: I633077e37d0851b118c22da0681e8b8b1892ddbb
Reviewed-by: Olivier Goffart <ogoffart@woboq.com>
QDateTime - Split QDateTimeParser into a separate file

Not strictly needed yet, but helps to reduce the size of QDateTime and
make it easier to read a major re-write.  Imposes separation of parser
which will be needed if we make QLocale always use the system backends,
after which only QDateTimeEdit widget will need the parser and it can
be moved there.

Change-Id: I6a5e9a3edf6fe8ff2340af6afecd8ba4bfde9dd4
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Mitch Curtis <mitch.curtis@digia.com>