Wai.common

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- Fixed bug in get_argument_to_typevar.
- Added new property type for configurations, MapProperty, which behaves like a dict from
strings to some sub-property type.
- Configurations now support: validation of additional properties, initialisation by value
or JSON, programmatically getting/setting additional properties.

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- Added meta package for typing functionality.

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- Fixed bug where Absent was being validated after Property.validate_value had checked
it, and therefore failing.

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- Added interfaces for serialising/deserialising JSON using custom representations.
- Added exception package to meta package for processing exceptions. Currently only
contains ExceptionChainer, which captures exceptions as a context-manager and then
provides methods for processing them.
- Added utility interface JSONValidatedBiserialisable.
- Refactored configurations and properties to be more understandable.
- Added AnyOfProperty.

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- Two new iterable functions, all_meet_predicate and any_meets_predicate.
- Added meta-functions for determining if methods in base-classes have been overridden
by sub-classes.
- Rejigged abc package.
- Added JSON package, with tools for working with JSON and JSONSchema. Also specifies the
configuration class, which allows for easy manipulation of JSON files in an object-oriented
manner.

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- Added load_dir function to file package, which can load all files in a directory.
- Added is_hashable to test if an object is hashable.
- Added Interval class representing intervals on the number line.
- Added exception InvalidStateError for classes that get into an invalid setup.
- Added typing module for type-related functionality.
- Added first, which finds the first element of an iterable to match a predicate.
- Added statistics package with quartile functions.
- Added random, which returns the elements of an iterator in random order.
- Added meta package, with functions to set and retrieve arbitrary meta-data against
objects.
- Added ConstantIterator class, which returns the same value over and over again.
- Added metadata module to iterate, for working with metadata in iterables of objects.
- Modified TwoWayDict so type-inference works with Python-3.7.