Using custom figure definitions in Triquetrum

A main deliverable of Triquetrum is a graphical editor based on Graphiti to design and run Ptolemy II workflows. Graphiti is built on GEF but provides an own EMF-based model and API to define the graphical elements in a diagram, and their links to corresponding domain objects. The core concepts in this API are PictogramElements and GraphicsAlgorithms. These get rendered as Draw2d figures.

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