We're using chai-string as it provides the `equalIgnoreSpaces`
assertion which we use in our SVG tests.
However, that package does not seem to be maintained, and lists chai v4
as its peer dependency. We've moved on to chai v5 and this is causes
issues in one of our github workflows as dependencies cannot be
resolved.
So, I've extracted the assertion we need, and dropped the dependency.
Note that the tests for Lumina are failing, but that's not related to
the chai upgrade, rather it seems these tests fail because of issues in
the design that we'll tackle later (it's a brand new design yet to be
released).
This moves resolving of the config from the pattern constructor to the
init() method. The idea is that adding a part to a pattern is exactly
the same as adding a part to a design. In other words, late-stage adding
of parts would be no different as the config gets resolved after that.
This is currently broken in many different ways, but the unit tests
particular to this new way of resolving the config do pass.
