Add interface for freezing/thawing objects

This adds a new interface IFreezable, which denotes that your object
supports being 'frozen' (immutable) or 'thawed' (mutable). There is also
optional support for 'deep-freezing' objects, which disables the ability
to thaw them.

It also introduces a new exception called ObjectFrozen, which
implementations of IFreezable may or may not throw when you attempt to
modify a frozen object

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