Core/Game: Fix some issues detected by static analysis.

* Possible inefficient checking for 'list' emptiness.

* Variable '_scheduledScripts' is assigned in constructor body.
  Consider performing initialization in initialization list.

* Variable 'Text' is assigned in constructor body.
  Consider performing initialization in initialization list.

* Possible inefficient checking for 'm_loadedScripts' emptiness.

(cherry picked from commit 9a61049f88835fd6bdb75905f042583d038d0667)

Conflicts:
	src/server/game/Server/Packets/TicketPackets.cpp

src/server/game/AI/SmartScripts/SmartScript.cpp

@@ -3167,7 +3167,7 @@ void SmartScript::ProcessEvent(SmartScriptHolder& e, Unit* unit, uint32 var0, ui
                 std::list<Creature*> list;
                 me->GetCreatureListWithEntryInGrid(list, e.event.distance.entry, (float)e.event.distance.dist);
 
-                if (list.size() > 0)
+                if (!list.empty())
                     creature = list.front();
             }
 
@@ -3198,7 +3198,7 @@ void SmartScript::ProcessEvent(SmartScriptHolder& e, Unit* unit, uint32 var0, ui
                 std::list<GameObject*> list;
                 me->GetGameObjectListWithEntryInGrid(list, e.event.distance.entry, (float)e.event.distance.dist);
 
-                if (list.size() > 0)
+                if (!list.empty())
                     gameobject = list.front();
             }