Fix retina rendering issues with Qt Quick Controls

We need to scale the texture size since it has twice the pixel
count on retina macs.

Task-number: QTBUG-34922
Change-Id: I38ff316016ccb1e609037598f7107d62b3ba4295
Reviewed-by: Gunnar Sletta <gunnar.sletta@digia.com>
TextField: add editingFinished signal

Autotest is included.

Task-number: QTBUG-34780
Change-Id: I19e73ca0c988a9d294aca52f9c0eabb9274f40d7
Reviewed-by: J-P Nurmi <jpnurmi@digia.com>
SpinBox: add editingFinished signal

Autotest is included.

Task-number: QTBUG-34780
Change-Id: I2da9d57b409c24cbf1d90ce42da9b4071dd6dac8
Reviewed-by: J-P Nurmi <jpnurmi@digia.com>
Revert "ApplicationWindow has the WindowFullscreenButtonHint flag by default"

This reverts commit 29d1b0d209ebb267c5a6ac8402c33892c09b8de6.

This patch caused a regression resulting in QTBUG-35049
and should be reverted until we have a better fix.

Change-Id: I76f9fa9859742a63f33757456c64f70183c76178
Reviewed-by: Gabriel de Dietrich <gabriel.dedietrich@digia.com>
Set more window flags to keep Windows from omitting titlebar & buttons

This should not be necessary, but Windows does not treat the missing
Qt::CustomizeWindowHint the same as the other platforms do.

Task-number: QTBUG-35049
Change-Id: I81dc645dc1acf29b6ff4d5fc04f5dd3db94b0133
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Merge remote-tracking branch 'origin/release' into stable

Change-Id: I470ff77e4a52f37263c8f0d9bf789f10c643d659