Merge branch 'sector-portals' into 'next'

extras/conf/udb/Includes/SRB222_linedefs.cfg

src/deh_tables.c

src/hardware/hw_main.c

src/info.h

src/p_map.c

src/p_saveg.c

src/p_setup.c

src/p_spec.c

src/p_spec.h

src/r_bsp.c

src/r_bsp.h

src/r_defs.h

src/r_main.c

src/r_plane.c

src/r_plane.h

src/r_portal.c

src/r_portal.h

src/r_segs.c