[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

zone/mob.h

@@ -834,6 +834,7 @@ public:
 		uint8 in_hairstyle = 0xFF, uint8 in_luclinface = 0xFF, uint8 in_beard = 0xFF, uint8 in_aa_title = 0xFF,
 		uint32 in_drakkin_heritage = 0xFFFFFFFF, uint32 in_drakkin_tattoo = 0xFFFFFFFF,
 		uint32 in_drakkin_details = 0xFFFFFFFF, float in_size = -1.0f, bool send_appearance_effects = true);
+	void SetFaceAppearance(const FaceChange_Struct& face, bool skip_sender = false);
 	bool RandomizeFeatures(bool send_illusion = true, bool set_variables = true);
 	virtual void Stun(int duration);
 	virtual void UnStun();