Registering Layout renderers with func (one line needed), easier registering layout/layoutrender/targets

[304NotModified]

Easier adding of Layout renderers.

Just need one line :)

Example

//register ${text-fixed}
LayoutRenderer.Register("test-fixed", (info) => "2");

//test
Layout l = "${test-fixed}";
var result = l.Render(LogEventInfo.CreateNullEvent());
Assert.Equal("2", result);

Not sure about the name and API

real-life example

//register ${trace-identifier}
LayoutRenderer.Register("trace-identifier", (info) =>  HttpContext.Current.TraceIdentifier );

Using logEventInfo

LayoutRenderer.Register("message-length", (info) => info.Message.Length);

• rename AdhocLayoutRenderer to FuncLayoutRenderer and update methods

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[304NotModified]

docs: https://github.com/NLog/NLog/wiki/How%20to%20write%20a%20custom%20layout%20renderer