LogListener: add context menu for copy

This enables copying/clearing lines
by right clicking on the lines
in the log viewer.

java/org/contikios/cooja/plugins/LogListener.java

@@ -532,6 +532,14 @@ public void mouseClicked(MouseEvent e) {
         gui.signalMoteHighlight(d.ev.getMote());
     	}
 		});
+    // Copy options on right click popup menu.
+    var popupCopyMenu = new JPopupMenu("Copy");
+    popupCopyMenu.add(new JMenuItem(copyAllAction));
+    popupCopyMenu.add(new JMenuItem(copyAllMessagesAction));
+    popupCopyMenu.add(new JMenuItem(copyAction));
+    popupCopyMenu.addSeparator();
+    popupCopyMenu.add(new JMenuItem(clearAction));
+    logTable.setComponentPopupMenu(popupCopyMenu);
 
     /* Automatically update column widths */
     final TableColumnAdjuster adjuster = new TableColumnAdjuster(logTable);