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Add remaining std::string_view overloads #239

Job	Run time
windows (Win32, standard)	34s
ubuntu (g++, standard)	23s
windows (Win32, PUGIXML_WCHAR_MODE)	1m 3s
ubuntu (g++, PUGIXML_WCHAR_MODE)	10s
windows (Win32, PUGIXML_COMPACT)	1m 0s
ubuntu (g++, PUGIXML_COMPACT)	22s
windows (Win32, PUGIXML_NO_EXCEPTIONS)	49s
ubuntu (g++, PUGIXML_NO_EXCEPTIONS)	18s
windows (Win32, PUGIXML_STRING_VIEW)	48s
ubuntu (g++, PUGIXML_STRING_VIEW)	10s
windows (x64, standard)	27s
ubuntu (clang++, standard)	19s
windows (x64, PUGIXML_WCHAR_MODE)	33s
ubuntu (clang++, PUGIXML_WCHAR_MODE)	9s
windows (x64, PUGIXML_COMPACT)	35s
windows (x64, PUGIXML_NO_EXCEPTIONS)	35s
ubuntu (clang++, PUGIXML_COMPACT)	22s
windows (x64, PUGIXML_STRING_VIEW)	32s
ubuntu (clang++, PUGIXML_NO_EXCEPTIONS)	22s
ubuntu (clang++, PUGIXML_STRING_VIEW)	9s
macos (clang++, standard)	21s
macos (clang++, PUGIXML_WCHAR_MODE)	11s
macos (clang++, PUGIXML_COMPACT)	19s
macos (clang++, PUGIXML_NO_EXCEPTIONS)	24s
macos (clang++, PUGIXML_STRING_VIEW)	11s
	11m 6s

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