Fixes for Celebras (#720)

* update Celebras script to use improved broadcast texts

* Make Celebras the Redeemed non TemporarySummon so he respawns and persists

* remove unused Maraudon scripts

* simplify celebras_spirit script and add timeout on waiting for click on book

* data for Celebras gossip and spawn

* handle quick book click

* adapt migration npc_text to new schema

src/scripts/ScriptLoader.cpp

@@ -219,6 +219,7 @@ void AddSC_boss_landslide();
 void AddSC_boss_noxxion();
 void AddSC_boss_ptheradras();
 void AddSC_maraudon();
+void AddSC_instance_maraudon();
 void AddSC_boss_onyxia();                            //onyxias_lair
 void AddSC_boss_amnennar_the_coldbringer();          //razorfen_downs
 void AddSC_razorfen_downs();
@@ -492,6 +493,7 @@ void AddScripts()
     AddSC_boss_noxxion();
     AddSC_boss_ptheradras();
     AddSC_maraudon();
+    AddSC_instance_maraudon();
     AddSC_boss_onyxia();                                    //onyxias_lair
     AddSC_boss_amnennar_the_coldbringer();                  //razorfen_downs
     AddSC_razorfen_downs();