Make MorphologyFinder use file paths

We want to use file paths to locate morphologies now, so the old model
of get a list of names and hand it those back to get the contents
doesn't really make sense any more.

This abstraction initially came about as one idea I had for moving
morphologies out of the source tree was to put them in something like
git notes, where it's possible to look up information for one commit in
another ref in the repository, at which point this abstraction would
have been flexible enough to handle that as well as in the

However, moving the chunk morphologies into the definitions repository
has other benefits too, so it makes more sense to be honest about using
filenames in the API.

It remains as a single point where we can put the logic for knowing which
files in a repository look like morphologies, but if we need to remove
any further functionality, it should be replaced by a single function.

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