Core/Players: convert SMSG_SETUP_CURRENCY to packet class and backportet currency handling from master branch

sql/updates/characters/4.3.4/custom_2020_01_05_00_character.sql

@@ -0,0 +1,7 @@
+ALTER TABLE `character_currency`   
+	CHANGE `guid` `CharacterGuid` INT(10) UNSIGNED NOT NULL,
+	CHANGE `currency` `Currency` SMALLINT(5) UNSIGNED NOT NULL,
+	CHANGE `total_count` `Quantity` INT(10) UNSIGNED NOT NULL,
+	CHANGE `week_count` `WeeklyQuantity` INT(10) UNSIGNED NOT NULL,
+	CHANGE `season_count` `TrackedQuantity` INT(10) UNSIGNED NOT NULL,
+	ADD COLUMN `Flags` TINYINT(2) UNSIGNED NOT NULL AFTER `TrackedQuantity`;