Custom QSpinBox with hex in/output.

Cause KIntSpinBox not longer exists in KDE5.
Fixed crash when reading .hex filesize. QSpinBox -> KLSpinBoxWidget
Completed KDE4 port.
Completed KDE4 port.
Custom QSpinBox with hex in- and output.

Cause KIntSpinBox not longer exists in KDE5.
KDE4 port nearly complet, but to low priority.
Using Ui namespace for ui-object.
KLSpinBoxWidget suff.
Added klspinboxwidget files and its includepath.