Add the won field.

Because filtering on ending is fiddly and doesn't scale.
Add ghost kills, worst death + common killers.

Which allows me to take advantage of the newly introduced won field and
finally make use of the nemeses map/reduce.

Also generalised the more/less list toggle.
Fix Game scoping.

So the offset should always be current rather than when the rails started.
Handle broken logfile lines.

Hopefully anyway, I just saw a failure go with no recourse to handling
it. So now if another error occurs I might see what was the cause.
Introduce Collate and filter Dr correctly.

In order to have filtering on Draconians work I needed to redo
ParamsFilter as it had reached the limit of its utility. It's perhaps
not as native as extending with ActiveConcern but composition seems like
the simpler/cleaner solution in this instance.