added Game.GameSession

Barotrauma/BarotraumaShared/SharedSource/Lua/LuaClasses.cs

@@ -64,7 +64,13 @@ namespace Barotrauma
 				}
 			}
 
-			
+			public GameSession GameSession
+			{
+				get
+				{
+					return GameMain.GameSession;
+				}
+			}
 
 			public void OverrideTraitors(bool o)
 			{

Barotrauma/BarotraumaShared/SharedSource/Lua/LuaSetup.cs

@@ -274,6 +274,8 @@ namespace Barotrauma
 			UserData.RegisterType<ServerSettings>();
 			UserData.RegisterType<PrefabCollection<ItemPrefab>>();
 			UserData.RegisterType<PrefabCollection<JobPrefab>>();
+			UserData.RegisterType<GameSession>();
+			UserData.RegisterType<CampaignMode>();
 			
 			lua = new Script(CoreModules.Preset_SoftSandbox);