Implement FlxStreamBuffer and beginnings of ConsoleCommands in unreal

Source/Integration/IntegrationGameModeBase.h

@@ -43,6 +43,9 @@ public:
 	UPROPERTY(EditDefaultsOnly, Category = TangibleClasses)
 	TSubclassOf<AActor> ClassTangibleActor;
 
+	// Execute a debugging command, typed on the GUI.
+	void ExecuteDebuggingCommand(const FString &fs);
+
 	// Transfer console output from the Luprex engine to unreal.
 	void UpdateConsoleOutput();