initial work on transformers

So far it doesn't really do much yet, but it does have the machinery to
list the available transformers and run them. It also memorizes if the
transformers even need to be run at all, to save time if the current
configuration already matches.

The parameter UI still needs some work. This is fine because the first
transformer will not have any parameters (it's just the elevation fix).
We probably don't want to have a method that returns Markup, as that
makes it hard to implement localization in there, and the method would
need to be aware of bootstrap.

Another point to think about is documentation. I'd like some information
for the user what the "transformers" are, so we'll probably add a small
tagline and later extend the documentation with some more information (I
want a user chapter in there at some point anyway).

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