Enforce assign_range() mandates for sequence containers
#5086
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Resolves #5076 by statically asserting the mandates for the sequence containers
deque,forward_list,list, andvector.basic_stringalso defines a functionassign_range(), but I did not add a static assert to it:basic_stringincludes its own specification ofassign_range()which does not provide for any Mandates ([string.assign]/16). Besides, the standard doesn't listbasic_stringamong the sequence containers in [sequence.reqmts]/1, so it appears to me that [sequence.reqmts]/60 doesn't apply directly tobasic_string.