Core/Scripts: move npc_mountaineer_pebblebitty to DB

- move gossip text to DB and add quest condition
- remove core script npc_mountaineer_pebblebitty,
- thereby removing the file zone_loch_modan.cpp
- because the original core script dialog is incorrect

This version of the dialog can be verified from the following web pages:
- http://wow.gamepedia.com/Key_to_Searing_Gorge_quest_chain
- http://www.wowhead.com/npc=3836/mountaineer-pebblebitty#comments:id=332234

(cherry picked from commit 25881de7d3)

src/server/scripts/EasternKingdoms/eastern_kingdoms_script_loader.cpp

@@ -186,7 +186,6 @@ void AddSC_eastern_plaguelands();
 void AddSC_ghostlands();
 void AddSC_hinterlands();
 void AddSC_isle_of_queldanas();
-void AddSC_loch_modan();
 void AddSC_redridge_mountains();
 void AddSC_silverpine_forest();
 void AddSC_stormwind_city();
@@ -373,7 +372,6 @@ void AddEasternKingdomsScripts()
     AddSC_ghostlands();
     AddSC_hinterlands();
     AddSC_isle_of_queldanas();
-    AddSC_loch_modan();
     AddSC_redridge_mountains();
     AddSC_silverpine_forest();
     AddSC_stormwind_city();

src/server/scripts/EasternKingdoms/zone_loch_modan.cpp

@@ -1,36 +0,0 @@
-/*
- * Copyright (C) 2008-2017 TrinityCore <http://www.trinitycore.org/>
- * Copyright (C) 2006-2009 ScriptDev2 <https://scriptdev2.svn.sourceforge.net/>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2 of the License, or (at your
- * option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/* ScriptData
-SDName: Loch_Modan
-SD%Complete: 0
-SDComment:
-SDCategory: Loch Modan
-EndScriptData */
-
-/* ContentData
-EndContentData */
-
-#include "ScriptMgr.h"
-#include "ScriptedCreature.h"
-#include "ScriptedGossip.h"
-#include "Player.h"
-
-void AddSC_loch_modan()
-{
-}