Added missing <forward_list> header #153

Job	Run time
generate_header	11s
run-msvc / msvc (14.3, false, Debug)	2m 16s
run-gcc / gcc (11, Debug)	3m 57s
run-msvc / msvc (14.3, false, Release)	2m 16s
run-clang / clang (17, false, Debug)	2m 50s
run-gcc / gcc (11, Release)	3m 52s
run-clang / clang (17, false, Release)	2m 51s
run-msvc / msvc (14.3, true, Debug)	2m 21s
run-gcc / gcc (12, Debug)	4m 29s
run-clang / clang (17, true, Debug)	3m 32s
run-msvc / msvc (14.3, true, Release)	2m 24s
run-gcc / gcc (12, Release)	4m 32s
run-clang / clang (17, true, Release)	2m 49s
run-gcc / gcc (13, Debug)	4m 16s
run-clang / clang (18, false, Debug)	2m 57s
run-gcc / gcc (13, Release)	4m 7s
run-clang / clang (18, false, Release)	2m 59s
run-clang / clang (18, true, Debug)	2m 45s
run-clang / clang (18, true, Release)	2m 33s
	57m 57s

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