Allow changing of default clipboard handler

[m3t4f1v3]

What do you want

An easy way to change the command that copies the selected message to the clipboard

Why

I use cordless over ssh, and I have to type out links manually.

Implementation hints

I believe a section in the config file that would override the default method of copying to the clipboard would be the best way to implement it.

[Bios-Marcel]

Have you tested XForwarding?

[m3t4f1v3]

Have you tested XForwarding?

I'm using a webSSH client so I can't use XForwarding

[Bios-Marcel]

For this, we'd need to replace both atoto/clipboard and Bios-Marcel/goclipimg