Fix static builds with ICU

Make sure we actually link against the static version of the ICU libs for
static builds.

Task-number: QTBUG-29478

Change-Id: Ida7b439f11c5393bee43bfe804f9ec84bf272b34
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>
Revert 6497649730daeab5d3dfac7e806105e99a237656 and clarify docs.

It introduced a regression by requiring that a p/P was also present:

QTime time = QTime::currentTime();
qDebug() << time.toString("h:mm:ss a");
// Outputs "10:05:42 am" in Qt 4.8.
// Outputs "10:05:42 a" with 6497649730daeab5d3dfac7e806105e99a237656.

This patch also clarifies the QTime::toString(QString) documentation.

Change-Id: I4d73a959c2ca76304f03a4ce9717b540ad4e8811
Reviewed-by: Andy Shaw <andy.shaw@digia.com>
Correct QString's warnings involving QRegularExpression.

Replaces "QRegularExpresssion" with "QRegularExpression" and adds some
auto tests for the warning itself.

Task-number: QTBUG-30054

Change-Id: Iba333a4388795eccca809fb430c295f503794263
Reviewed-by: Jędrzej Nowacki <jedrzej.nowacki@digia.com>
do not append a trailing slash to output directory

it's entirely counterproductive and confuses the subsequent code.

Change-Id: Iadcfd2af80acd2d7ed50807b3e001e26d83075a5
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>