Add constructor overload for SliderOption<T> that allows specifying legend,data etc

[tznind]

Is your feature request related to a problem? Please describe.

Sometimes it is preferable to initialize from the constructor rather than with Object Initializers. For example CodeDOM CodeObjectCreateExpression does not support object initializers.

Currently to construct a SliderOption<string> you would have to do:

new SliderOption<string> { Legend = "l1", LegendAbbr = new Rune('1'), Data = "Fun1" }

We should also support:

new SliderOption<string> ("l1",new Rune('1'),"Fun1" );

Describe the solution you'd like
Add constructor overload.

Describe alternatives you've considered
Code could declare a local variable for every option but this starts to get onerous.

var foo = new SliderOption<string>();
foo. Legend = "l1";
foo.LegendAbbr  = new Rune('1');
foo.Data =  "Fun1";