Code Cleanup: Destroy() fixes part 1 + Misc Fixes (#1933)

In this PR:

Destroy() fixes backported from PR #1783.
JaniPDA fixes & improvements.
Chickens no longer consume their own eggs.
Language adding in setup is now 100% more sane.
Chemical dispensers now actually check that the user is still alive before renaming.
Ghosts are now marked as non-simulated atoms.
Non-simulated atoms no longer trigger proximity listeners.
Vendors no longer accept synthetic tools as stocking options.
Fixes #812.
Fixes #1877, Fixes #1929.
Fixes #1930.
Fixes #1152, Fixes #1917.
Fixes #1902.
Fixes #1165.

code/modules/organs/organ.dm

@@ -28,6 +28,7 @@ var/list/organ_cache = list()
 	var/emp_coeff = 1 //coefficient for damages taken by EMP, if the organ is robotic.
 
 /obj/item/organ/Destroy()
+	processing_objects -= src
 	if(!owner)
 		return ..()
 
@@ -44,6 +45,9 @@ var/list/organ_cache = list()
 	if(src in owner.contents)
 		owner.contents -= src
 
+	owner = null 
+	QDEL_NULL(dna)
+
 	return ..()
 
 /obj/item/organ/proc/update_health()