Converted the GetAttribute methods in the ToolBox class to extension methods

Barotrauma/BarotraumaShared/Source/GameSession/GameModes/MultiplayerCampaign.cs

@@ -262,7 +262,7 @@ namespace Barotrauma
 
         public void Load(XElement element)
         {
-            Money = ToolBox.GetAttributeInt(element, "money", 0);
+            Money = element.GetAttributeInt("money", 0);
 
             foreach (XElement subElement in element.Elements())
             {

Barotrauma/BarotraumaShared/Source/GameSession/GameSession.cs

@@ -118,7 +118,7 @@ namespace Barotrauma
             Submarine.MainSub = submarine;
 
             GameMain.GameSession = this;
-            selectedSub.Name = ToolBox.GetAttributeString(doc.Root, "submarine", selectedSub.Name);
+            selectedSub.Name = doc.Root.GetAttributeString("submarine", selectedSub.Name);
 #if CLIENT
             CrewManager = new CrewManager();
 #endif

Barotrauma/BarotraumaShared/Source/GameSession/InfoTextManager.cs

@@ -21,7 +21,7 @@ namespace Barotrauma
         {
             infoTexts = new Dictionary<string, List<string>>();
 
-            XDocument doc = ToolBox.TryLoadXml(file);
+            XDocument doc = XMLExtensions.TryLoadXml(file);
             if (doc == null || doc.Root == null) return;            
 
             foreach (XElement subElement in doc.Root.Elements())