* Serious refactor of - and internal exposure of - what has become S_StartCaption().
* Renaming of a few existing captions.
* The prevention of access to - or writing over - sfx_None's stuff in SOC or Lua.
* The new Lua wrapper function S_StartMusicCaption(string, tics, optional player), which essentially allows custom music captions to be created. (This is best used for stuff like final lap music in SRB2 Kart or bonus time in a thokker-like game, not a comprehensive Now Playing expy. That'd be a different kettle of fish.)
Also, updated all the lock-on stuff to use P_IsLocalPlayer instead of rolling my own.
* Provides a helpful description for the hearing impaired, whether permanent, temporary or situational.
* Consvar "closedcaptioning", with on/off values available.
* Only works if sounds are on. This is frustrating. I will see what I can do to allow it to work with sounds off in future, but for now it's dependent in order to properly accept or decline sounds.
* Thanks to MI for making that wiki page a lot more comprehensive a few days ago.
* Weapon ring is now a seperate sfx_wepfir instead of doubling up on sfx_thok.
* Also, made V_StringWidth work with V_NOSCALESTART.
Use whatever names you want for your music. So long as you prefix the lumps with O_ or D_, it doesn't matter anymore.
DISCLAIMER: Linedef type 413 (change music) and Lua scripting is not tested.
(cherry picked from commit 025ca413a2)
# Conflicts:
# src/p_user.c
