Added <System.FileExists(FilePath)> construct

Returns if the specified file (including extension) exists (relative to the GameMode's ContentPath).

P3D/World/ActionScript/V2/ScriptConstructs/DoSystem.vb

@@ -152,8 +152,10 @@
                     Return output
                 Case "scriptlevel"
                     Return ActionScript.ScriptLevelIndex.ToString()
-                case "language"
+                Case "language"
                     Return Localization.LanguageSuffix
+                Case "fileexists"
+                    Return ReturnBoolean(GameModeManager.ContentFileExists(argument))
             End Select
 
             Return DefaultNull

P3D/World/ActionScript/V2/ScriptLibrary.vb

@@ -435,6 +435,8 @@ Namespace ScriptVersion2
             r(New ScriptCommand("system", "issng", "bool", {New ScriptArgument("expression", ScriptArgument.ArgumentTypes.Str)}.ToList(), "Checks if the expression is a single (Outdated, use <math.issng> instead).", ",", True))
             r(New ScriptCommand("system", "chrw", "str", {New ScriptArgument("charCodes", ScriptArgument.ArgumentTypes.IntArr)}.ToList(), "Converts Unicode CharCodes into a string.", ",", True))
             r(New ScriptCommand("system", "scriptlevel", "int", "Returns the current script level (call depth).", ",", True))
+            r(New ScriptCommand("system", "Language", "str", "Returns the current game language suffix.", ",", True))
+            r(New ScriptCommand("system", "FileExists", "bool", {New ScriptArgument("filePath", ScriptArgument.ArgumentTypes.Str)}.ToList(), "Returns if the specified file (including extension) exists (relative to the GameMode's ContentPath).", ",", True))
         End Sub
 
         Private Shared Sub DoEnvironment()