Add support of configuration_setter

A configuration setter must implement only one method: `handle($key, $value)`.
Before setting a value in configuration, the setter will be called with this
method to check its validity.
If a setter has been assigned to a configuration object, it will be called for
each of its data so be careful to always return a value (or null if you want
to delete the key).

See https://github.com/FreshRSS/FreshRSS/issues/730

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