Merge branch 'pictureformats' into 'next'

src/CMakeLists.txt

src/Makefile

src/dehacked.c

src/hardware/hw_cache.c

src/hardware/hw_main.c

src/hu_stuff.c

src/lua_infolib.c

src/m_anigif.c

src/m_menu.c

src/p_maputl.c

src/p_saveg.c

src/p_setup.c

src/p_setup.h

src/p_spec.c

src/r_data.c

src/r_data.h

src/r_local.h

src/r_main.c

src/r_main.h

src/r_picformats.c