V_Sim specific widgets

DumpDialog — Defines a widget to export into different file formats.
NumericalEntry — Defines a widget to enter numerical values without any boundary or precision constrains.
OrientationChooser — Defines a dialog widget to choose the camera position.
ToolPanel — Defines a widget that hold a set of V_Sim panel.
ColorComboBox — Defines a specialised GtkComboBox to choose stored colours.
ShadeComboBox — Defines a specialised GtkComboBox to choose pre-built shades.
StippleComboBox — Defines a specialised GtkComboBox to choose patterns for lines.
LineObject — Defines a specialised GtkHBox to choose all characteristic of lines.