Added support for nemo's cashshop preview (#5896)

Fixes #5744

Credits to @4144
Thanks to @RagnaWay

src/config/core.hpp

@@ -81,6 +81,9 @@
 // Do NOT create any issues or ask for help with these compilers.
 //#define DEPRECATED_COMPILER_SUPPORT
 
+/// Uncomment for use with Nemo patch ExtendCashShopPreview
+//#define ENABLE_CASHSHOP_PREVIEW_PATCH
+
 /**
  * No settings past this point
  **/

src/map/clif.cpp

@@ -16807,6 +16807,17 @@ void clif_cashshop_list( struct map_session_data* sd ){
 		for( int i = 0; i < cash_shop_items[tab].count; i++ ){
 			p->items[i].itemId = client_nameid( cash_shop_items[tab].item[i]->nameid );
 			p->items[i].price = cash_shop_items[tab].item[i]->price;
+#ifdef ENABLE_CASHSHOP_PREVIEW_PATCH
+			struct item_data* id = itemdb_search( cash_shop_items[tab].item[i]->nameid );
+
+			if( id == nullptr ){
+				p->items[i].location = 0;
+				p->items[i].viewSprite = 0;
+			}else{
+				p->items[i].location = pc_equippoint_sub( sd, id );
+				p->items[i].viewSprite = id->look;
+			}
+#endif
 		}
 
 		WFIFOSET( fd, len );

src/map/packets_struct.hpp

@@ -2527,6 +2527,10 @@ struct PACKET_ZC_ACK_SCHEDULER_CASHITEM_sub {
 	uint16 itemId;
 #endif
 	uint32 price;
+#ifdef ENABLE_CASHSHOP_PREVIEW_PATCH
+	uint16 viewSprite;
+	uint32 location;
+#endif  // ENABLE_CASHSHOP_PREVIEW_PATCH
 } __attribute__((packed));
 
 struct PACKET_ZC_ACK_SCHEDULER_CASHITEM {
@@ -4028,6 +4032,104 @@ struct PACKET_ZC_PERSONAL_INFOMATION {
 DEFINE_PACKET_HEADER(ZC_PERSONAL_INFOMATION, 0x097b);
 #endif  // PACKETVER_MAIN_NUM >= 20120503 || PACKETVER_RE_NUM >= 20120502 || defined(PACKETVER_ZERO)
 
+struct PACKET_CZ_REQUEST_ACTNPC {
+	int16 packetType;
+	uint32 GID;
+	uint32 targetGID;
+	int8 action;
+} __attribute__((packed));
+
+#if PACKETVER < 3
+struct PACKET_ZC_NOTIFY_SKILL {
+	int16 PacketType;
+	uint16 SKID;
+	uint32 AID;
+	uint32 targetID;
+	uint32 startTime;
+	int32 attackMT;
+	int32 attackedMT;
+	int16 damage;
+	int16 level;
+	int16 count;
+	int8 action;
+} __attribute__((packed));
+DEFINE_PACKET_HEADER(ZC_NOTIFY_SKILL, 0x0114);
+#else
+struct PACKET_ZC_NOTIFY_SKILL {
+	int16 PacketType;
+	uint16 SKID;
+	uint32 AID;
+	uint32 targetID;
+	uint32 startTime;
+	int32 attackMT;
+	int32 attackedMT;
+	int32 damage;
+	int16 level;
+	int16 count;
+	int8 action;
+} __attribute__((packed));
+DEFINE_PACKET_HEADER(ZC_NOTIFY_SKILL, 0x01de);
+#endif 
+
+#if PACKETVER_MAIN_NUM >= 20130731 || PACKETVER_RE_NUM >= 20130724 || defined(PACKETVER_ZERO)
+struct PACKET_ZC_USE_SKILL {
+	int16 PacketType;
+	uint16 SKID;
+	int32 level;
+	uint32 targetAID;
+	uint32 srcAID;
+	int8 result;
+} __attribute__((packed));
+DEFINE_PACKET_HEADER(ZC_USE_SKILL, 0x09cb);
+#else
+struct PACKET_ZC_USE_SKILL {
+	int16 PacketType;
+	uint16 SKID;
+	int16 level;
+	uint32 targetAID;
+	uint32 srcAID;
+	int8 result;
+} __attribute__((packed));
+DEFINE_PACKET_HEADER(ZC_USE_SKILL, 0x011a);
+#endif
+
+struct PACKET_ZC_NOTIFY_GROUNDSKILL {
+	int16 PacketType;
+	uint16 SKID;
+	uint32 AID;
+	int16 level;
+	int16 xPos;
+	int16 yPos;
+	uint32 startTime;
+} __attribute__((packed));
+DEFINE_PACKET_HEADER(ZC_NOTIFY_GROUNDSKILL, 0x0117);
+
+#if PACKETVER_MAIN_NUM >= 20081112 || PACKETVER_RE_NUM >= 20081111 || defined(PACKETVER_ZERO)
+struct PACKET_ZC_SKILL_POSTDELAY {
+	int16 PacketType;
+	uint16 SKID;
+	uint32 DelayTM;
+} __attribute__((packed));
+DEFINE_PACKET_HEADER(ZC_SKILL_POSTDELAY, 0x043d);
+#endif
+
+struct PACKET_ZC_NOTIFY_SKILL_POSITION {
+	int16 PacketType;
+	uint16 SKID;
+	uint32 AID;
+	uint32 targetID;
+	uint32 startTime;
+	int32 attackMT;
+	int32 attackedMT;
+	int16 xPos;
+	int16 yPos;
+	int16 damage;
+	int16 level;
+	int16 count;
+	int8 action;
+};
+DEFINE_PACKET_HEADER(ZC_NOTIFY_SKILL_POSITION, 0x0115);
+
 #if !defined(sun) && (!defined(__NETBSD__) || __NetBSD_Version__ >= 600000000) // NetBSD 5 and Solaris don't like pragma pack but accept the packed attribute
 #pragma pack(pop)
 #endif // not NetBSD < 6 / Solaris