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>