[PATCH] Extend --clip/--qrcode to support copying/displaying non-password fields

[jman]

"Dan Crawford" <dnlcrwfrd at gmail.com> writes: 
 
> This patch extends --clip (and incidentally, --qrcode) to support either copying arbitrary lines 
> (with the existing syntax), or copying the value of some field. Given the above passfile, 
> --clip="field1" or -c"field1" will add `key1` to the clipboard.

Hi and thanks for this patch, I can finally remove the workaround I use to programmatically get 
other fields (.. | head -n).

I have probably a corner case where this patch fails:

supersecretpass
login: mechanik
url: https://www.ecommerce.com

`pass <item> --clip=url` copies only "https:" and not the full URL. 

Second question: do you mind reformatting your patch with `git format-patch` so I can cleanly apply 
it to my passwordstore.sh and keep credits intact? 

Thanks!