Core/Arena: Fixes the Config option for the start rating of personal rating.

Add a Config option for the start rating of matchmaker rating.
Personal rating now resets when joining a new team.
Fixes the strange behaviour Personal rating gain/loss can have opposing to team rating,
by using a better way of calculating the personal rating gain.
Fixes issue #3871
Fixes issue #3847
Fixes issue #3843
Fixes issue #3839

--HG--
branch : trunk

src/server/game/World/World.cpp

@@ -1043,7 +1043,8 @@ void World::LoadConfigSettings(bool reload)
     m_bool_configs[CONFIG_ARENA_QUEUE_ANNOUNCER_PLAYERONLY]          = sConfig.GetBoolDefault("Arena.QueueAnnouncer.PlayerOnly", false);
     m_int_configs[CONFIG_ARENA_SEASON_ID]                            = sConfig.GetIntDefault ("Arena.ArenaSeason.ID", 1);
     m_int_configs[CONFIG_ARENA_START_RATING]                         = sConfig.GetIntDefault ("Arena.ArenaStartRating", 0);
-    m_int_configs[CONFIG_ARENA_START_PERSONAL_RATING]                = sConfig.GetIntDefault ("Arena.ArenaStartPersonalRating", 0);
+    m_int_configs[CONFIG_ARENA_START_PERSONAL_RATING]                = sConfig.GetIntDefault ("Arena.ArenaStartPersonalRating", 1000);
+    m_int_configs[CONFIG_ARENA_START_MATCHMAKER_RATING]              = sConfig.GetIntDefault ("Arena.ArenaStartMatchmakerRating", 1500);
     m_bool_configs[CONFIG_ARENA_SEASON_IN_PROGRESS]                  = sConfig.GetBoolDefault("Arena.ArenaSeason.InProgress", true);
     m_bool_configs[CONFIG_ARENA_LOG_EXTENDED_INFO]                   = sConfig.GetBoolDefault("ArenaLog.ExtendedInfo", false);
 

src/server/game/World/World.h

@@ -284,6 +284,7 @@ enum WorldIntConfigs
     CONFIG_ARENA_SEASON_ID,
     CONFIG_ARENA_START_RATING,
     CONFIG_ARENA_START_PERSONAL_RATING,
+    CONFIG_ARENA_START_MATCHMAKER_RATING,
     CONFIG_MAX_WHO,
     CONFIG_HONOR_AFTER_DUEL,
     CONFIG_PVP_TOKEN_MAP_TYPE,