Draft: Graphical plot of yMMSL configuration

[DaanVanVugt]

The idea is to have a nice method to visualize the workflow you are developing. For this a new command is defined

muscle3 graph file.ymmsl

See --help for an up-to-date description of the options.

Things to do still

• [ ] Provide documentation
• [ ] See if we can make the arrows 'feel' more in the direction of data flow
• [ ] More distinct styling (thick lines, like MMSL docs? different colors for stateful / stateless actors?)
• [ ] Show implementation name
• [ ] Investigate hovering for more details (should work in svg)
• [ ] Compare a few layout engines (needs example cases)
• [ ] Plot unconnected ports (optional)
• [ ] Investigate options for live-updating (show running, waiting models, message counts)