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Polish the failure summary (#181)

* Polish failure summary

This polishes the failure summary by grouping and sorting errors by the keys
they originated from. Incidentally, this fixes an issue with the keys for errors
of Map derivations not being properly concatenated, and makes the output of the
WrongType failure more uniform, by always referring to the appropriate
ConfigValueTypes.

* Improve message of CollidingKeys

* Remove string interpolation in favor of toString calls

* Use ConfigValueType in WrongType

Since we only deal with instances of ConfigValueType in WrongType (converting
them to strings), it makes sense that the expected arguments are
ConfigValueTypes instead of strings.

* Remove redundant wording

* Replace 'with' with 'at'

* Make descriptionWithLocation local to ConfigReaderException

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