Add custom color and shape to the inspector graph

[Nyan11]

It could be usefull to add a color and a shape to the component who are BlElement.

To do it, we could add a pragma with a rule to detect the component that are BlElement and change their colors and their shape.

It would be nice to also generate a legend to the roassal graph with the different colors and shapes + the logo for event/services/parameters.

[LabordePierre]

I think we can extent this feature to all component that are augmented.
As illustrated in the figure 6 (https://inria.hal.science/hal-02966691/preview/ICSR_15years.pdf) we can use a different shape (and color) between a component which inerit from MolAbstractComponentImpl and an augmented class.