Merge remote-tracking branch 'remotes/SRB2/vanilla-hotplug' into unfuck-gamepads

# Conflicts:
#	src/d_clisrv.c
#	src/d_netcmd.c
#	src/d_netcmd.h
#	src/dehacked.c
#	src/doomdef.h
#	src/g_game.c
#	src/hu_stuff.c
#	src/lua_baselib.c
#	src/m_menu.c
#	src/sdl/i_system.c
#	src/sdl/sdlmain.h