The `InterpolationRenderer` was violating the open-closed principle,
because every time we would want to add a new modifier, we would need to
change its implementation.
This commit changes that behaviour by creating a `Modifier` interface.
The classes implementing that interface are using a chain of
responsibility to pass the data to the next one. Using a chain of
responsibility makes a lot of sense, since it's only possible to have
one modifier at a time.
