Merge branch 'next' into slope-fixes

.travis.yml

appveyor.yml

src/am_map.c

src/b_bot.c

src/g_game.c

src/hardware/hw_main.c

src/hardware/hw_md2.c

src/lua_hudlib.c

src/m_cheat.c

src/mserv.c

src/p_map.c

src/p_maputl.c

src/p_spec.c

src/p_user.c

src/r_segs.c

src/r_things.c

src/sdl/i_video.c