util.array: Expose array.* functions, to be used for unwrapped arrays

util.iterators: New iterators library

util.array: New array library

util.set: Rename private items container, optimise set.difference() and add set.intersection()

core.rostermanager/mod_roster: Support for roster versioning

util.datamanager: Don't delete data when first entry in table is 'false'. My favourite bug so far.

mod_component: Remove some commented code

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