Implemented functions for HashMap, SortedMap, HashSet, SortedSet, Seq #6
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I have doubts about the naming of 'HashMap.ofSeqWith', 'HashMap.builderWithKeyComparer', 'hashMap.builderWithComparers', 'HashMap.ofSeqGroupBy', ''ofComparer', 'ofSeqWithComparer', 'builderWithComparer'.
@vilinski, @sergey-tihon, please review