Add support for reading/writing QSizeF values.
Add support for reading/writing QSizeF values.

pranavrc/example-gluon,pranavrc/example-gluon,KDE/gluon,cgaebel/gluon,cgaebel/gluon,cgaebel/gluon,pranavrc/example-gluon,KDE/gluon,KDE/gluon,cgaebel/gluon,KDE/gluon,pranavrc/example-gluon