Merge branch SRB2:next into propercheats

.circleci/config.yml

.gitlab-ci.yml

extras/conf/udb/Includes/SRB222_linedefs.cfg

libs/miniupnpc/.gitattributes

libs/miniupnpc/CMakeLists.txt

libs/miniupnpc/Changelog.txt

libs/miniupnpc/LICENSE

libs/miniupnpc/MANIFEST.in

libs/miniupnpc/Makefile

libs/miniupnpc/Makefile.mingw

libs/miniupnpc/README

libs/miniupnpc/VERSION

libs/miniupnpc/apiversions.txt

libs/miniupnpc/bsdqueue.h

libs/miniupnpc/declspec.h

libs/miniupnpc/external-ip.sh

libs/miniupnpc/include/igd_desc_parse.h

libs/miniupnpc/include/miniupnpc.h

libs/miniupnpc/include/miniupnpc_declspec.h

libs/miniupnpc/include/miniupnpctypes.h