Umbraco-cms: Add keyboard support for slider

[bjarnef]

I think it would be great to add keyboard suppport when the handle has focus as in the example.
https://refreshless.com/nouislider/examples/#section-keyboard

There is also an discussion here about keyboard support with two handles:
https://github.com/leongersen/noUiSlider/issues/203

I also found this gist to improve the accessibility of noUiSlider.
https://gist.github.com/felixgirault/3fcb18ee0268b1c3127c

[nul800sebastiaan]

I've marked this as "Up for grabs" so that you or someone else coming along could create a pull request for it.

[bjarnef]

@nul800sebastiaan @nielslyngsoe any chance we can update nouislider to version 13.0.0, which now comes with keyboard support build in.
https://github.com/umbraco/Umbraco-CMS/blob/1090d54763deb6ca69ca609476fa19b041fca388/src/Umbraco.Web.UI.Client/package.json#L38

https://github.com/leongersen/noUiSlider/issues/724#issuecomment-461009737

/cc @MMasey

[nul800sebastiaan]

@bjarnef Sure, go for it!

[bjarnef]

@nul800sebastiaan of course that would be version 13.1.5 at the time of writing.
https://github.com/leongersen/noUiSlider/releases

From the release notes in seems there are no breaking changes since the current version of noUiSlider used in Umbraco, but mainly enhancement and bug fixes.

[nul800sebastiaan]

Yeah, all good, v13 does not have any breaking changes listed so should be fine.

[bjarnef]

I will have a look at it.

[bjarnef]

PR submitted: https://github.com/umbraco/Umbraco-CMS/pull/5651