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/Scripting/ScriptMgr.cpp

@@ -182,9 +182,8 @@ struct TSpellSummary
     uint8 Effects;                                          // set of enum SelectEffect
 } *SpellSummary;
 
-ScriptMgr::ScriptMgr() : _scriptCount(0)
+ScriptMgr::ScriptMgr() : _scriptCount(0), _scheduledScripts(0)
 {
-    _scheduledScripts = 0;
 }
 
 ScriptMgr::~ScriptMgr() { }