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Enhancing and addressing some issues around exceptions: (#477)

* Enhancing and addressing some issues around exceptions:

issue #452: all exception types are now hashable and immutable
issue #445: a human readable and primitive only option is available (e.g. for json serialization)
issue #369: follows PEP-352 conventions, and normalizes all errors found in an .errors attribute

* string representations of error messages are equivalent to json formatting a primitive representation. This representation was chosen for legibility and simplicity. It's an implementation detail to serialize to json, and shouldn't be relied on. (serializing `to_primitive` exists for that purpose)

* errors dicts and lists are converted to FrozenDict and FrozenList. Although they might contain mutable data inside, we expect that indicating the base container as immutable users will understand not to mutate data inside (it's not clear what problems it would cause, the goal is simply to provide an immutable interface for the Schematics errors).

* exceptions instantiation now with a single parameter, that is the error object (string, list, dict or other).

* exceptions `repr` can be `eval`d.

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