mod_smacks_noerror: Add ability to silence errors if mod_offline is disabled This will also silence "message not delivered" errors if mod_offline is disabled and all clients are offline. This assumes working MAM for all clients (lready assumed by the rest of this module).

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summary: Remote Roster Management
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Introduction
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This module adds support for [XEP-0321: Remote Roster Management] which
is commonly used to allow components such as transports to modify the
rosters of local users.