Prevent endless loop in run_scheduled_functions

[hreintke]

When scheduling the same function from within a scheduled function the "run_scheduled_function" does not finish -> loop is not being called anymore.

Example function is :

void CommandExecutor::getStreamChars(Stream* reqStream)
{
	if (reqStream->available())
	{
		executorReceive(reqStream->read());
	}
	schedule_function(std::bind(&CommandExecutor::getStreamChars,this,reqStream));
}

I am using this in order to have all the code within my classes and not dependent on (addtional) calls from within the loop fucntion,

This patch starts a a new chain of scheduled functions when starting current cycle