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/client/preference_setup/general/02_language.dm

@@ -75,6 +75,9 @@
 			else
 				var/new_lang = input(user, "Select an additional language", "Character Generation", null) as null|anything in available_languages
 				if(new_lang)
-					pref.alternate_languages |= new_lang
+					if (pref.alternate_languages.len >= S.num_alternate_languages)
+						alert(user, "You have already selected the maximum number of alternate languages for this species!")
+					else
+						pref.alternate_languages |= new_lang
 					return TOPIC_REFRESH
 	return ..()