Remove ITaskManager.toSafeHandler

[Geod24]

agora/source/agora/common/Task.d

Lines 67 to 81 in 676ad91

	/// Converts an unsafe timer handler to safe, `dg` will be executed in
	/// `trusted` and exceptions happening inside the handler will be logged
	private SafeTimerHandler toSafeHandler (UnsafeTimerHandler dg)
	{
	return (() @safe nothrow
	{
	() @trusted
	{
	try
	dg();
	catch (Exception e)
	this.log.error("Timer handler caused an exception: {}", e.msg);
	} ();
	});
	}

It claims to convert an unsafe delegate to a safe one. There's no such thing. Non-nothrow to nothrow is fine but nothing can make a @system delegate @safe.