paredit.killSexpForward should copy deleted code to clipboard

[xfthhxk]

Firstly, thanks so much for Calva! I'm coming from a Spacemacs/emacs background where killing an s-expression copies the s-expression to the clipboard which makes moving code around much easier. I'd like to see paredit.killSexpForward and paredit.killSexpBackward copy the deleted text to the clipboard.

[PEZ]

Hello, thanks for the feature request! It has been discussed before in #559, and then concluded that there is another extension that lets you chain the paredit.Select* commands and Cut to Clipboard, which achieves this effect.

As is also discussed there is that this is pretty uncommon behaviour for VS Code. It would come as a surprise that deleting something also overwrites what was previously on your clipboard.

Using that other extension is a bit unconvenient and adds setup, granted, and also a bit hard to discover. So I'm leaning towards that we should build it in to Calva Paredit, as your PR has started to do. If so we should:

1. Place it behind a setting (maybe calva.paredit.killAlsoCutsToClipboard that is default off.
2. Make it consistent over all Kill commands.
3. Document it. Probaby here: https://calva.io/paredit/#editing

[xfthhxk]

Thanks for the input @PEZ . Will incorporate your feedback and update the PR.

[xfthhxk]

@PEZ PR #1284 has been updated per your suggestions. Please have a look. Thanks!