Add #69: Let IterableAccessor satisfy ranges::input_range #478

Job	Run time
build_linux_deprecated_extensions (gcc-9)	2m 0s
build_linux (gcc-9, NO)	1m 58s
build_linux_deprecated_extensions (gcc-10)	2m 46s
build_linux (gcc-10, NO)	2m 17s
build_linux_deprecated_extensions (clang-13)	3m 26s
build_windows (NO)	3m 26s
build_windows_deprecated_extensions	3m 6s
build_linux (gcc-10, YES)	2m 19s
build_windows (YES)	3m 23s
build_linux (clang-13, NO)	2m 11s
build_linux (clang-15, NO)	2m 9s
build_linux (clang-15, YES)	2m 20s
	31m 21s

Provide feedback