Add support for sending images by pasting from the clipboard

[Flaviongas]

I usually send screenshots in Whatsapp, but to send a screenshot i have to convert it to a file and then send it.

[d99kris]

Hi @Flaviongas - thanks for reporting a feature request. Given this is a bit of a corner-case and there are various complexities to handle (especially if handling pasting files in general), I'm not sure I will get to this any time soon. But I will leave the request here..

[d99kris]

Support for sending images by pasting from the clipboard has been implemented in e673d06 / v5.11.26. To enable the functionality install libpng-dev or equivalent, and build latest nchat. Look out for the following to confirm libpng headers are found:

-- Looking for png.h - found
-- Clipboard: Text, Image

Use alt/opt-v to paste images. By default nchat prompts a confirmation dialog, which may be disabled by setting confirm_send_pasted_image=0 in ui.conf