Add Quenya ⟨hl⟩ and Sindarin ⟨lh⟩

Both represent a “voiceless L”; Appendix E of The Lord of the Rings
notes that the Quenya ⟨hl⟩ was pronounced like /l/ by the Third Age, but
for now we reproduce the original pronunciation. (Maybe we can later use
conditional rules for different pronunciations, but I think for now I
won’t go down that road.)

dictsource/qya_rules

@@ -69,7 +69,8 @@
 	h	h
 	L02) ht	Ct
 	L03) ht	xt
-	// TODO hl, hr, hw, hy
+	hl	l#
+	// TODO hr, hw, hy
 
 .group i
 	i	I