Event Graphing Function Issues

[Zankoas]

The very useful event graphing function is currently disabled by default, requiring you to add:

## graph_related_types = { }

under the types of the thing you want to graph, events in this case, creating a barrier to people using this very useful function.

In addition:

1. For unknown reasons, some event files fail to graph at all, just giving a blank screen.
2. The save graph as image function appears to do nothing

[Alpinia]

As of now, the graph function seems to be quite stable. I noticed it struggles with dynamic event titles, however.

[Zankoas]

Fixed by magic!

[Zankoas]

Finally been able to reproduce the Graph function being unable to load a file. See this file here:

American_Civil_War.txt

[Zankoas]

Looks like this every time: