Fix music load lag by reverting tag changes

See merge request STJr/SRB2!486

# Conflicts:
#	src/d_netcmd.c
#	src/doomdef.h
#	src/doomstat.h
#	src/f_finale.c
#	src/g_game.c
#	src/hu_stuff.c
#	src/m_menu.c
#	src/p_spec.c
#	src/p_user.c
#	src/r_main.c
#	src/r_things.c
#	src/s_sound.c
#	src/v_video.c
#	src/y_inter.c

Merge in next and don't billboard papersprites in GL

See merge request !488

# Conflicts:
#	src/p_user.c

New ping command

See merge request !123

Grab mouse focus whenever the window is focused

See merge request !120

Don't try operating on a closed socket

See merge request !133

Ban IP command

See merge request STJr/SRB2!460

Don't count down wait timer when executing a command line

See merge request !483

OpenGL Sprite Billboarding

See merge request !485

add parentheses around these conditions to fix sloped lights cutting out lights on FOF walls for apparently no reason

not making a merge request because this is so laughably stupidly simple

Don't enable UPnP support if NONET is defined.

See merge request !484

Because songs without this tag will skiplag when loading.

1. It's slow, 2. It's incorrect

Allow argument substitution in aliases

See merge request !124

Register showjoinaddress after the config loads and match some other cvars to its behavior

See merge request !135

Expose cv_numlaps.value as global variable

See merge request !134

New -port command line parameter

See merge request !137

When I say Encore you say how high

See merge request !136

Should work on both normal and precipitation sprites.
Sprites that are split by lighting should work correctly.

MD2/MD3 support rewritten + optimizations [GCC port]

See merge request !19

New intermission Hook for Y_Ticker

See merge request !131