[GB.GTK]
* NEW: Remove PictureBox control.

[GB.GTK3]
* NEW: Remove PictureBox control.

[GB.GUI.BASE]
* NEW: PictureBox is now implemented in Gambas.
* NEW: PictureBox: Image is a new property that allows to display an Image instead of a Picture.
* NEW: PictureBox: Mode is a new property that defines how the image fills the control.

[GB.QT4]
* NEW: Remove PictureBox control.

[GB.QT5]
* NEW: Remove PictureBox control.