[Reboot] No touch-friendly Paste Functionality Implemented

[cm-t 🦄🏂🌈🎵]

In the Reboot, Paste functionality needs to be added (touch-friendly).

Note: If the circle overlay is going to be implemented (see bug #1396915 ) like it was before, copy/paste might be not possible with the ubuntu long tap (make a tooltip panel with copy/paste/select all) since the overlay will be triggered instead: might need to add a button in a panel/overlay or something.

[Filippo Scognamiglio (flscogna)]

This is definitely something that I'm going to introduce. At the moment the issue only issue is where we are going to put it, taking into account also the other needs, we still need to design a little bit.

[Jonas G. Drange (jonas-drange)]

I really like iSSH's way of handling copy, which is the most important thing for me.

1a Double tap on word, it gets selected
1b Triple tap on word, line gets selected
2a Copy by tapping on selection
2b Discard selection by tapping elsewhere

[Evan McIntire (mcintire-evan)]

Here's a comment relating to this, https://code.launchpad.net/~mcintire-evan/ubuntu-terminal-app/disable-paste/+merge/283244/comments/725331, some work on this idea will (hopefully) be done soon :)