Core/LFG: implement weekly reward counter to limit the first dungeon rewards

* all default random rewards can be rewarded 7 times per week
* raid finder first reward can be rewarded once per week
* if completionsPerWeek = 0 the currency caps will limit the first rewards otherwise first rewards can be always rewarded
* random Cataclysm normal dungeons will now reward 140 Justice points instead of 150
* second reward for random Cataclysm normal dungeons will now reward gold only (need to verify this)

sql/updates/characters/4.3.4/custom_2018_04_18_00_characters.sql

@@ -0,0 +1,7 @@
+DROP TABLE IF EXISTS `character_rewardstatus_lfg`;
+CREATE TABLE `character_rewardstatus_lfg`(  
+  `guid` INT(10) NOT NULL DEFAULT 0 COMMENT 'Global Unique Identifier',
+  `dungeonId` SMALLINT(3) NOT NULL DEFAULT 0 COMMENT 'Dungeon ID Identifier',
+  `rewardCount` TINYINT(3) UNSIGNED DEFAULT 0 COMMENT 'Dungeon First Reward Count Identifier',
+  PRIMARY KEY (`dungeonId`)
+);