Merge #384: Add copy IP/Netmask action for banned peer

ab1461d qt: Add copy IP/Netmask action for banned peer (Shashwat)

Pull request description:

  This PR adds a Copy IP/Netmask context menu action to the Banned Peers Table.

  This feature is helpful if a node using GUI might want to alert its peer about a particular malicious user. So it can copy that user’s IP/Netmask and broadcast it to its peers so they can ban it instantly using the setban command in the console.

  | Master        | PR               |
  | ----------- | ----------- |
  | ![Screenshot_from_2021-07-21_00-01-331](https://user-images.githubusercontent.com/23396902/126377808-bd23bb19-3f47-4f1b-8371-39baa9747bbe.png) | ![Screenshot from 2021-08-20 20-13-28(1)(1)](https://user-images.githubusercontent.com/85434418/130251441-a8d0f816-a2e9-4e63-a22d-94885c5cec98.png) |

ACKs for top commit:
  jarolrod:
    re-ACK ab1461d
  hebasto:
    re-ACK ab1461d, tested on Linux Mint 20.2 (Qt 5.12.8).

Tree-SHA512: a528f089bd4cb5b51fec987550d21c2587459ad80f854b55850bc62c776c21f3fa31052a17e2b0e9e9d0b3468799c8070ed306543730fb7b324f283847151e17

src/qt/rpcconsole.cpp

@@ -706,6 +706,13 @@ void RPCConsole::setClientModel(ClientModel *model, int bestblock_height, int64_
 
         // create ban table context menu
         banTableContextMenu = new QMenu(this);
+        /*: Context menu action to copy the IP/Netmask of a banned peer.
+            IP/Netmask is the combination of a peer's IP address and its Netmask.
+            For IP address see: https://en.wikipedia.org/wiki/IP_address */
+        banTableContextMenu->addAction(tr("&Copy IP/Netmask"), [this] {
+            GUIUtil::copyEntryData(ui->banlistWidget, BanTableModel::Address, Qt::DisplayRole);
+        });
+        banTableContextMenu->addSeparator();
         banTableContextMenu->addAction(tr("&Unban"), this, &RPCConsole::unbanSelectedNode);
         connect(ui->banlistWidget, &QTableView::customContextMenuRequested, this, &RPCConsole::showBanTableContextMenu);