Buffs arm implants (#19773)

* fuck it signal time

* heres a great example of simplifcation!

* fuck it sometimes you have to ball, fuck stoplag

* fuck yeah baby, mob signals instead

* bam good code

* add support for drop button

* lets not drop nulls

* sirryan review

code/modules/mob/inventory.dm

@@ -103,6 +103,7 @@
 
 /mob/proc/drop_item_v()		//this is dumb.
 	if(stat == CONSCIOUS && isturf(loc))
+		SEND_SIGNAL(usr, COMSIG_MOB_WILLINGLY_DROP)
 		return drop_item()
 	return 0
 
@@ -125,10 +126,10 @@
 
 /mob/proc/canUnEquip(obj/item/I, force)
 	if(!I)
-		return 1
+		return TRUE
 	if((I.flags & NODROP) && !force)
-		return 0
-	return 1
+		return FALSE
+	return TRUE
 
 /mob/proc/unEquip(obj/item/I, force, silent = FALSE) //Force overrides NODROP for things like wizarditis and admin undress.
 	if(!I) //If there's nothing to drop, the drop is automatically succesfull. If(unEquip) should generally be used to check for NODROP.

code/modules/mob/mob_defines.dm

@@ -44,6 +44,7 @@
 	var/memory = ""
 	var/next_move = null
 	var/notransform = FALSE	//Carbon
+	/// True for left hand active, otherwise for right hand active
 	var/hand = null
 	var/real_name = null
 	var/flavor_text = ""