RFE: Switch from clipboard to copypasta

[ignatenkobrain]

The clipboard is using some really old version of x11-clipboard on Linux. copypasta is fork of clipboard which supports Wayland and is generally maintained these days.

Sorry that I did not spot this last time you mentioned me on the issue about new dependency.

[ignatenkobrain]

Or even https://crates.io/crates/cli-clipboard which is probably better in terms of wayland support, though I did not try it yet.

[ignatenkobrain]

@extrawurst let me know if you won't have time to play with this in near future in which case I'll try to write patch myself :)