STL: We should _STD qualify _Ugly function calls to avoid ADL

See "ADL can interfere even with uglified names" by Arthur O'Dwyer.

We've survived 20+ years with unqualified _Ugly function calls, but perhaps we should consider changing this. It's possible that this could improve throughput.

List of headers to process, as mentioned in https://github.com/microsoft/STL/issues/140#issuecomment-1247361313 below (cvt subtree intentionally omitted):

• __msvc_all_public_headers.hpp
• __msvc_chrono.hpp
• __msvc_format_ucd_tables.hpp
• __msvc_int128.hpp
• __msvc_iter_core.hpp
• __msvc_system_error_abi.hpp
• __msvc_tzdb.hpp
• __msvc_xlocinfo_types.hpp
• algorithm
• any
• array
• atomic
• barrier
• bit
• bitset
• cassert
• ccomplex
• cctype
• cerrno
• cfenv
• cfloat
• charconv
• chrono
• cinttypes
• ciso646
• climits
• clocale
• cmath
• codecvt
• compare
• complex
• concepts
• condition_variable
• coroutine
• csetjmp
• csignal
• cstdalign
• cstdarg
• cstdbool
• cstddef
• cstdint
• cstdio
• cstdlib
• cstring
• ctgmath
• ctime
• cuchar
• cwchar
• cwctype
• deque
• exception
• execution
• expected
• experimental/coroutine
• experimental/deque
• experimental/filesystem
• experimental/forward_list
• experimental/generator
• experimental/list
• experimental/map
• experimental/resumable
• experimental/set
• experimental/string
• experimental/unordered_map
• experimental/unordered_set
• experimental/vector
• filesystem
• format
• forward_list
• fstream
• functional
• future
• hash_map
• hash_set
• initializer_list
• iomanip
• ios
• iosfwd
• iostream
• iso646.h
• istream
• iterator
• latch
• limits
• list
• llll
• locale
• map
• memory
• memory_resource
• mutex
• new
• numbers
• numeric
• optional
• ostream
• queue
• random
• ranges
• ratio
• regex
• scoped_allocator
• semaphore
• set
• shared_mutex
• source_location
• span
• spanstream
• sstream
• stack
• stacktrace
• stdatomic.h
• stdexcept
• stop_token
• streambuf
• string
• string_view
• strstream
• syncstream
• system_error
• thread
• tuple
• type_traits
• typeindex
• typeinfo
• unordered_map
• unordered_set
• use_ansi.h
• utility
• valarray
• variant (#3148)
• vector
• version
• xatomic.h
• xatomic_wait.h
• xbit_ops.h
• xcall_once.h
• xcharconv.h
• xcharconv_ryu.h
• xcharconv_ryu_tables.h
• xcharconv_tables.h
• xerrc.h
• xfacet
• xfilesystem_abi.h
• xhash
• xiosbase
• xkeycheck.h
• xlocale
• xlocbuf
• xlocinfo
• xlocmes
• xlocmon
• xlocnum
• xloctime
• xmemory
• xnode_handle.h
• xpolymorphic_allocator.h
• xsmf_control.h
• xstddef
• xstring
• xthreads.h
• xtimec.h
• xtr1common
• xtree
• xutility
• ymath.h
• yvals.h
• yvals_core.h

Review the linked ADL article and the issue comment that defines the header list, then inspect the listed STL headers and the completed variant item (#3148). Work through the checklist while checking the existing _Ugly calls and excluding the cvt subtree. Done means the applicable headers are processed and the checklist reflects the completed work.