ADL-proof implementation of function, move_only_function, packaged_task, promise, and optional
#4430
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Towards #140 and #3100.
Unblocks one libcxx test:
std/utilities/function.objects/func.wrap/func.wrap.func/robust_against_adl.pass.cppAlso contains some drive-by and previously missed changes.
_STD-qualification for oneshared_ptr-related_Unfancycall (which is not strictly necessary)._STD-qualification for_Deallocateand_Make_unique_alloccalls (which are not strictly necessary IIUC)._Global_newfrom<xmemory>to<functional>because it is only used forfunction.Remaining unqualified
_Construct_in_placeand_Destroy_in_placecalls after this PR are all in containers andvalarray.