Merge 2021-06 LWG Motion 4

P1132R8 out_ptr - a scalable output pointer abstraction

The original motion named the paper as P1132R7, but it was updated to the revised version P1132R8 that contains minor editorial corrections.

Author: tkoeppe

source/support.tex

@@ -652,6 +652,7 @@
 #define @\defnlibxname{cpp_lib_not_fn}@                            201603L // also in \libheader{functional}
 #define @\defnlibxname{cpp_lib_null_iterators}@                    201304L // also in \libheader{iterator}
 #define @\defnlibxname{cpp_lib_optional}@                          201606L // also in \libheader{optional}
+#define @\defnlibxname{cpp_lib_out_ptr}@                           202106L // also in \libheader{memory}
 #define @\defnlibxname{cpp_lib_parallel_algorithm}@                201603L // also in \libheader{algorithm}, \libheader{numeric}
 #define @\defnlibxname{cpp_lib_polymorphic_allocator}@             201902L // also in \libheader{memory_resource}
 #define @\defnlibxname{cpp_lib_quoted_string_io}@                  201304L // also in \libheader{iomanip}