Copy and Paste from System Clipboard

[AmmarAbouZor]

It would be helpful to have the ability to copy and past from system clipboard. The current workaround using tmux or other terminal emulator built-in isn't that clear and forces the users to use other software to perform a task that can be implemented directly in the application.

The cross platform compatibility is something to consider since we need to make sure it works on X11 and Wayland on Linux and with Windows and Macos as well.