Core: Codestyle clean-up

"pl"->"player"

 Note: codestyle methods needs maintained, Player* player.
still to do properly clean-up chat.cpp.

src/server/game/Achievements/AchievementMgr.cpp

@@ -46,8 +46,8 @@ namespace Trinity
     class AchievementChatBuilder
     {
         public:
-            AchievementChatBuilder(Player const& pl, ChatMsg msgtype, int32 textId, uint32 ach_id)
-                : i_player(pl), i_msgtype(msgtype), i_textId(textId), i_achievementId(ach_id) {}
+            AchievementChatBuilder(Player const& player, ChatMsg msgtype, int32 textId, uint32 ach_id)
+                : i_player(player), i_msgtype(msgtype), i_textId(textId), i_achievementId(ach_id) {}
             void operator()(WorldPacket& data, LocaleConstant loc_idx)
             {
                 char const* text = sObjectMgr->GetTrinityString(i_textId, loc_idx);

src/server/game/Achievements/AchievementMgr.h

@@ -244,7 +244,7 @@ class WorldPacket;
 class AchievementMgr
 {
     public:
-        AchievementMgr(Player* pl);
+        AchievementMgr(Player* player);
         ~AchievementMgr();
 
         void Reset();