UIEditor : Added NodeGraph section.
UIEditor : Added NodeGraph section.

This allows the following to be controlled :

- The type of the nodule
- The position of the nodule
- The colour of the nodule
- The colour of input connections

ivanimanishi/gaffer,andrewkaufman/gaffer,ivanimanishi/gaffer,chippey/gaffer,GafferHQ/gaffer,johnhaddon/gaffer,GafferHQ/gaffer,GafferHQ/gaffer,johnhaddon/gaffer,andrewkaufman/gaffer,hradec/gaffer,chippey/gaffer,andrewkaufman/gaffer,appleseedhq/gaffer,ivanimanishi/gaffer,chippey/gaffer,andrewkaufman/gaffer,ImageEngine/gaffer,boberfly/gaffer,lucienfostier/gaffer,boberfly/gaffer,hradec/gaffer,boberfly/gaffer,johnhaddon/gaffer,ivanimanishi/gaffer,hradec/gaffer,ImageEngine/gaffer,hradec/gaffer,appleseedhq/gaffer,lucienfostier/gaffer,johnhaddon/gaffer,ImageEngine/gaffer,GafferHQ/gaffer,lucienfostier/gaffer,ImageEngine/gaffer,hradec/gaffer,appleseedhq/gaffer,boberfly/gaffer,andrewkaufman/gaffer,johnhaddon/gaffer,chippey/gaffer,GafferHQ/gaffer,appleseedhq/gaffer,lucienfostier/gaffer