Being drunk or having a broken arm hurts accuracy with ranged weapons. Also cleans up a fair bit of hand handling to be more readable (#87904)

## About The Pull Request

1. Having a broken arm will affect your accuracy when firing a weapon
with that arm, even potentially causing damage to you if it's a weapon
with recoil. This effect is not applied under the effects of a
painkiller.

2. The sister effect of this (punching someone with a broken arm) now
also has an interact with painkillers (it can no longer block your
attack).

3. Being drunk heavily affects ranged weapon accuracy, unless you're the
bartender

4. A lot of hand handling cleanup, using new macros to make it a lot
more readable at a glance

## Why It's Good For The Game

We have this system for modifying firearm accuracy but we don't really
use it commonly, and I feel like it slots in well with a lot of places

For broken arms, it adds some more depth to the wound system, in the
same way that trying to punch someone with a broken arm causes pain. (I
actually want to expand this to melee weapon accuracy and attacking with
melee weapons in general, but that's for a later time)

For drunkenness, it just adds to the drunk shenanigans. It also slightly
reduces the effectiveness of drinks as combat healing chemicals, such as
quadsec - makes it a bit more of a trade off.

## Changelog

🆑 Melbert
balance: Having a broken arm affects your accuracy with ranged weapons
fired with that arm. Utilizing a painkiller will nullify this effect,
however.
balance: Painkillers will prevent your punches from being cancelled due
to having a broken arm. You'll still take damage, though.
balance: Being drunk now affects your accuracy with ranged weapon. The
bartender is immune to this effect via their skillchip.
code: A lot of code involving left and right hand handling has been
cleaned up, easier to read. Report any oddities, like left and rights
being flipped
/🆑

code/modules/library/bibles.dm

@@ -367,8 +367,7 @@ GLOBAL_LIST_INIT(bibleitemstates, list(
 	uses -= 1
 	to_chat(user, span_userdanger("You try to open the book AND IT BITES YOU!"))
 	playsound(src.loc, 'sound/effects/snap.ogg', 50, TRUE)
-	var/active_hand_zone = (!(user.active_hand_index % RIGHT_HANDS) ? BODY_ZONE_R_ARM : BODY_ZONE_L_ARM)
-	user.apply_damage(5, BRUTE, active_hand_zone, attacking_item = src)
+	user.apply_damage(5, BRUTE, user.get_active_hand(), attacking_item = src)
 	to_chat(user, span_notice("Your name appears on the inside cover, in blood."))
 	owner_name = user.real_name