[Opcode] Implement SetFace opcode (#2167)

* Implement SetFace opcode

This implements the opcode that's used to update zone clients when a
client updates their face

* Use SetFace in #feature command

Add check for valid number

This adds the #feature eyes command which isn't in the illusion struct

common/patches/titanium_ops.h

@@ -66,6 +66,7 @@ E(OP_ReadBook)
 E(OP_RespondAA)
 E(OP_SendCharInfo)
 E(OP_SendAATable)
+E(OP_SetFace)
 E(OP_ShopPlayerSell)
 E(OP_SpecialMesg)
 E(OP_TaskDescription)