Memory management fixes

src/command.c

src/d_netcmd.c

src/deh_soc.c

src/f_finale.c

src/g_demo.c

src/g_game.c

src/hardware/hw_main.c

src/hardware/hw_md2.c

src/hardware/hw_md2.h

src/hardware/hw_md2load.c

src/hardware/hw_md3load.c

src/hardware/hw_model.c

src/hardware/hw_model.h

src/hu_stuff.c

src/lua_hudlib.c

src/lua_mobjlib.c

src/lua_skinlib.c

src/m_menu.c

src/p_enemy.c

src/p_mobj.c