0.53.0

• Added the concept of a global format for disconnected nodes along with a format plug.

• Added the Constant node for GafferImage.

• Added the Select node for GafferImage.

• Fixed a bug which prevented Assignment nodes from being connected to Shaders outside the Box containing the Assignment.

• Improved formatting in NumericWidgets.

• Added NumericWidget.valueChangedSignal().

• Fixed bug where editing a numeric plug value using cursor up/down didn’t immediately update.

• Added CompoundDataPlug::addMember() and CompoundDataPlug::addOptionalMember() overloads which take a ValuePlug instead of Data to provide the value for the member.