Core/Mysql: Multiple changes

- added support for setting NULL column values to MySQL wrapper in core
- replaced nonstandard strdup function and manual memory management with std::string
- fixed bug in MySQLPreparedStatement::getQueryString method, it failed when string parameter contained embedded '?' symbols
- fixed memory leak in MySQLPreparedStatement::setString method

src/server/shared/Database/Implementation/CharacterDatabase.h

@@ -60,10 +60,6 @@ enum CharacterDatabaseStatements
     CHAR_SEL_BANNED_NAME,
     CHAR_SEL_ENUM,
     CHAR_SEL_ENUM_DECLINED_NAME,
-    CHAR_SEL_PET_SLOTS,
-    CHAR_SEL_PET_SLOTS_DETAIL,
-    CHAR_SEL_PET_ENTRY,
-    CHAR_SEL_PET_SLOT_BY_ID,
     CHAR_SEL_FREE_NAME,
     CHAR_SEL_GUID_RACE_ACC_BY_NAME,
     CHAR_SEL_CHAR_RACE,
@@ -369,19 +365,12 @@ enum CharacterDatabaseStatements
     CHAR_SEL_CHAR_CLASS_LVL_AT_LOGIN,
     CHAR_SEL_CHAR_AT_LOGIN_TITLES,
     CHAR_SEL_INSTANCE,
-    CHAR_SEL_PET_SPELL_LIST,
-    CHAR_SEL_CHAR_PET,
-    CHAR_SEL_CHAR_PETS,
     CHAR_SEL_CHAR_COD_ITEM_MAIL,
     CHAR_SEL_CHAR_SOCIAL,
-    CHAR_SEL_PET_AURA,
     CHAR_SEL_CHAR_OLD_CHARS,
     CHAR_SEL_ARENA_TEAM_ID_BY_PLAYER_GUID,
     CHAR_SEL_MAIL,
     CHAR_SEL_CHAR_PLAYERBYTES2,
-    CHAR_SEL_PET_SPELL,
-    CHAR_SEL_PET_SPELL_COOLDOWN,
-    CHAR_SEL_PET_DECLINED_NAME,
     CHAR_SEL_CHAR_GUID_BY_NAME,
     CHAR_DEL_CHAR_AURA_FROZEN,
     CHAR_SEL_CHAR_INVENTORY_COUNT_ITEM,
@@ -392,9 +381,6 @@ enum CharacterDatabaseStatements
     CHAR_SEL_MAIL_ITEMS_BY_ENTRY,
     CHAR_SEL_AUCTIONHOUSE_ITEM_BY_ENTRY,
     CHAR_SEL_GUILD_BANK_ITEM_BY_ENTRY,
-    CHAR_SEL_CHAR_PET_BY_ENTRY,
-    CHAR_SEL_CHAR_PET_BY_ENTRY_AND_SLOT_2,
-    CHAR_SEL_CHAR_PET_BY_SLOT,
     CHAR_DEL_CHAR_ACHIEVEMENT,
     CHAR_DEL_CHAR_ACHIEVEMENT_PROGRESS,
     CHAR_DEL_CHAR_REPUTATION_BY_FACTION,
@@ -411,24 +397,9 @@ enum CharacterDatabaseStatements
     CHAR_DEL_GROUP_INSTANCE_BY_MAP_DIFF,
     CHAR_DEL_INSTANCE_BY_MAP_DIFF,
     CHAR_DEL_MAIL_ITEM_BY_ID,
-    CHAR_DEL_CHAR_PET_DECLINEDNAME,
-    CHAR_ADD_CHAR_PET_DECLINEDNAME,
-    CHAR_UPD_CHAR_PET_NAME,
     CHAR_INS_PETITION,
     CHAR_DEL_PETITION_BY_GUID,
     CHAR_DEL_PETITION_SIGNATURE_BY_GUID,
-    CHAR_UDP_CHAR_PET_SLOT_BY_SLOT_EXCLUDE_ID,
-    CHAR_UDP_CHAR_PET_SLOT_BY_SLOT,
-    CHAR_UPD_CHAR_PET_SLOT_BY_ID,
-    CHAR_DEL_CHAR_PET_BY_ID,
-    CHAR_DEL_CHAR_PET_BY_SLOT,
-    CHAR_DEL_PET_AURAS,
-    CHAR_DEL_PET_SPELLS,
-    CHAR_DEL_PET_SPELL_COOLDOWNS,
-    CHAR_INS_PET_SPELL_COOLDOWN,
-    CHAR_DEL_PET_SPELL_BY_SPELL,
-    CHAR_INS_PET_SPELL,
-    CHAR_INS_PET_AURA,
     CHAR_DEL_CHAR_DECLINED_NAME,
     CHAR_INS_CHAR_DECLINED_NAME,
     CHAR_UPD_FACTION_OR_RACE,
@@ -461,8 +432,6 @@ enum CharacterDatabaseStatements
     CHAR_DEL_CHAR_SPELL,
     CHAR_DEL_MAIL,
     CHAR_DEL_MAIL_ITEMS,
-    CHAR_DEL_CHAR_PET_BY_OWNER,
-    CHAR_DEL_CHAR_PET_DECLINEDNAME_BY_OWNER,
     CHAR_DEL_CHAR_ACHIEVEMENTS,
     CHAR_DEL_CHAR_EQUIPMENTSETS,
     CHAR_DEL_GUILD_EVENTLOG_BY_PLAYER,
@@ -498,13 +467,46 @@ enum CharacterDatabaseStatements
     CHAR_DEL_CHAR_TALENT_BY_SPELL_SPEC,
     CHAR_INS_CHAR_TALENT,
     CHAR_DEL_CHAR_ACTION_EXCEPT_SPEC,
-    CHAR_SEL_CHAR_PET_BY_ENTRY_AND_SLOT,
 
     CHAR_REP_CALENDAR_EVENT,
     CHAR_DEL_CALENDAR_EVENT,
     CHAR_REP_CALENDAR_INVITE,
     CHAR_DEL_CALENDAR_INVITE,
 
+    CHAR_SEL_PET_AURA,
+    CHAR_SEL_PET_SPELL,
+    CHAR_SEL_PET_SPELL_COOLDOWN,
+    CHAR_SEL_PET_DECLINED_NAME,
+    CHAR_DEL_PET_AURAS,
+    CHAR_DEL_PET_SPELL_COOLDOWNS,
+    CHAR_INS_PET_SPELL_COOLDOWN,
+    CHAR_DEL_PET_SPELL_BY_SPELL,
+    CHAR_INS_PET_SPELL,
+    CHAR_INS_PET_AURA,
+
+    CHAR_DEL_PET_SPELLS,
+    CHAR_DEL_CHAR_PET_BY_OWNER,
+    CHAR_DEL_CHAR_PET_DECLINEDNAME_BY_OWNER,
+    CHAR_SEL_CHAR_PET_BY_ENTRY_AND_SLOT,
+    CHAR_SEL_PET_SLOTS,
+    CHAR_SEL_PET_SLOTS_DETAIL,
+    CHAR_SEL_PET_ENTRY,
+    CHAR_SEL_PET_SLOT_BY_ID,
+    CHAR_SEL_PET_SPELL_LIST,
+    CHAR_SEL_CHAR_PET,
+    CHAR_SEL_CHAR_PETS,
+    CHAR_SEL_CHAR_PET_BY_ENTRY,
+    CHAR_SEL_CHAR_PET_BY_ENTRY_AND_SLOT_2,
+    CHAR_SEL_CHAR_PET_BY_SLOT,
+    CHAR_DEL_CHAR_PET_DECLINEDNAME,
+    CHAR_ADD_CHAR_PET_DECLINEDNAME,
+    CHAR_UPD_CHAR_PET_NAME,
+    CHAR_UDP_CHAR_PET_SLOT_BY_SLOT_EXCLUDE_ID,
+    CHAR_UDP_CHAR_PET_SLOT_BY_SLOT,
+    CHAR_UPD_CHAR_PET_SLOT_BY_ID,
+    CHAR_DEL_CHAR_PET_BY_ID,
+    CHAR_DEL_CHAR_PET_BY_SLOT,
+
     CHAR_SEL_ITEMCONTAINER_ITEMS,
     CHAR_DEL_ITEMCONTAINER_ITEMS,
     CHAR_DEL_ITEMCONTAINER_ITEM,