Graph custom nodes

[geofjamg]

• Do you want to request a feature or report a bug?
  Feature

• What is the current behavior?
  ComponentLibrary manage a set of svg associated to a node in the substation Graph thanks to enum ComponentType. If a substation diagram user wants to add a custom node with a custom rendering, there is no way to do it without forking the source code, adding a new value in the ComponentType enum, add the SVG to the ComponentLibrary and also hack the Graph class to insert the custom node.

• What is the expected behavior?

  • replace ComponentType by a String
  • Add a plugin GraphBuildPostProcessor discovered using java.util.ServiceLoader and that would allow adding custom nodes to the graph.

• What is the motivation / use case for changing the behavior?
  To allow projects to customize substation graph and rendering.

• Please tell us about your environment:

  • PowSyBl Version: ...
  • OS Version: ...

• Other information (e.g. detailed explanation, stacktraces, related issues, suggestions how to fix, links for us to have context, eg. stackoverflow, spectrum, etc)

(if a question doesn't apply, you can delete it)

[geofjamg]

Solved by #168