[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_structs.h

@@ -1761,8 +1761,7 @@ struct AdventureRequestResponse_Struct{
 struct Illusion_Struct {
 /*000*/	uint32	spawnid;
 /*004*/	char	charname[64];
-/*068*/	uint16	race;
-/*070*/	char	unknown070[2];
+/*068*/	int race;
 /*072*/	uint8	gender;
 /*073*/	uint8	texture;
 /*074*/	uint8	helmtexture;