Closed captioning!

* 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.