implement feedback from issue #91 when sv_running is off

clean up a trying to abort thread which doesn't actually work with .net core
don't log event tasks cancelled as error, because it's not

SharedLibraryCore/Interfaces/IRConParserConfiguration.cs

@@ -24,6 +24,11 @@ namespace SharedLibraryCore.Interfaces
         /// </summary>
         ParserRegex Dvar { get; set; }
 
+        /// <summary>
+        /// Specifies the expected response message from rcon when the server is not running
+        /// </summary>
+        string ServerNotRunningResponse { get; set; }
+
         /// <summary>
         /// indicates if the application should wait for response from server
         /// when executing a command