#2970 enable copying and pasting of user name and password on Wayland

[Hiroo Ono]

The attached patches make use of wl-copy and wl-paste commands from wl-clipboard[1] to make copying and pasting of user name and password on Wayland on Unixes.

[1] https://github.com/bugaevc/wl-clipboard

[Dominik Reichl]

The workaround using xsel is disabled by default, because Mono's clipboard methods seem to work pretty well in the meanwhile (I tested it on various systems, including ones with Wayland).

So, on which operating system have you encountered an issue with the clipboard?

Thanks and best regards,
Dominik