V1 lua stuff

See merge request KartKrew/Kart!155

THIS SHOULD BE THE LAST TIME I SWEAR

Fix Post Processing in 64-bit Software 3P/4P

See merge request KartKrew/Kart!156

This reverts commit a2a63c5e.

Vid_BlitLinearScreen didn't make sure that it was actually meant to be copying the entire screen rows before doing it properly.

Spinout angle change when boosting

See merge request KartKrew/Kart!153

Make brakes stronger

See merge request KartKrew/Kart!154

(You may also be able to actually read that code too.)

Fixes stupid obvious mistakes and changes the prefcolor reset to item.

# Conflicts:
#	src/d_netcmd.c
#	src/r_main.c
#	src/v_video.c

Upstream merge of next

See merge request KartKrew/Kart-Public!139

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