Not planning to do this automatically, but at least cleaning it up once
provides some benefit. Every header should include what it uses.
$ for i in src/**/*.h; do j=${i#"src/"}; echo $j; echo "#include <$j>\nint main() { return 0; }" | /usr/bin/c++ -DCONF_OPENSSL -DCONF_SQL -DCONF_VIDEORECORDER -DCONF_WAVPACK_CLOSE_FILE -DCONF_WAVPACK_OPEN_FILE_INPUT_EX -DGAME_RELEASE_VERSION=\"15.0.5\" -DGLEW_STATIC -D_FORTIFY_SOURCE=2 -I/usr/include/freetype2 -I/usr/include/opus -I/usr/include/SDL2 -I/usr/include/wavpack -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/include/libmount -I/usr/include/blkid -Isrc -I/usr/include/mysql -I/home/deen/sys/include/ -O2 -g -DNDEBUG -fdiagnostics-color=always -fstack-protector-all -Wall -Wextra -Wno-unused-parameter -Wno-missing-field-initializers -Wformat=2 -Wno-nullability-completeness -Wduplicated-cond -Wduplicated-branches -Wlogical-op -Wrestrict -std=gnu++11 -o /dev/null -x c++ -; done
Ignored: tuning.h, variables.h, config_common.h, mapitems_ex_types.h, mapbugs_list.h, protocol7.h, teehistorian_ex_chunks.h, protocol_ex_msgs.h, config.h, config_variables.h, external, keynames.h
This system can easily be extended by independent authors without
collisions, something the old system with plain increasing integers did
not allow.
Do this by utilizing the previously unused message code `NETMSG_NULL`
which has a value of 0.
This works for engine and game messages, snapshot items and events.
