- Remove private copy of JGraphT 0.9.0
- Use JGraph 1.2.0 copy exported by af3.exploration
- Port source code, e.g.
  - moved packages
  - DirectedGraph -> DefaultDirectedGraph
  - CycleFoundException -> IllegalArgumentException
  - DirectedSubgraph -> MaskSubgraph

Issue-Ref: 3478
Issue-Url: https://af3-developer.fortiss.org/issues/3478



Signed-off-by: Simon Barner <barner@fortiss.org>