Revamp replacement hooks

- Replacement specifiers can be either strings or tuples. This lets us cope
gracefully with command-line parsing (and posible quick interactive
specification) without having to special-case replacement hooks, or have
knowledge of hook specification leak outside the addon. We can also now use the
same command-line spec format in config files.
- Split replacement and replacement from file into separate addons and options.
Files are now read on each replacement, so you can edit replacement files in
place without restart.
- Modernise the test suite to use addon test helpers.

TODO: editing and displaying replace-from-file in console app

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