Merge branch 'socks_trunnel4_squashed_merged'

changes/ticket3569_part1

scripts/codegen/fuzzing_include_am.py

src/core/or/socks_request_st.h

src/core/proto/proto_socks.c

src/test/fuzz/fuzz_socks.c

src/test/fuzz/include.am

src/test/test_socks.c

src/trunnel/include.am

src/trunnel/socks5.c

src/trunnel/socks5.h

src/trunnel/socks5.trunnel