QML: Add clipboard example

Signed-off-by: Juraj Oravec <jurajoravec@mailo.com>

qml/articles/6.Using_clipboard.md

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+# Falkon QML Tutorial - 6. Using clipboard
+
+Hello, in this chapter I will show you how to use Falkon clipboard. It
+is only possible to copy data out of the extension into the clipboard.
+
+
+## Use clipboard
+
+```qml
+Falkon.Clipboard.copy('Something from Falkon in the clipboard')
+```
+
+## Example
+The example code will add a context menu which will add 2 entries. One
+to copy something and other to copy image URL to the clipboard.
+
+### Code
+The code for this example can be found at
+[extensions/qml_tutorial_6](../extensions/qml_tutorial_6)
+

qml/extensions/qml_tutorial_6/main.qml

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+import org.kde.falkon 1.0 as Falkon
+import QtQuick 2.3
+
+Falkon.PluginInterface {
+
+    init: function(state, settingsPath){
+        console.log(i18n('"Tutorial6" plugin loaded'))
+        tutorial3Object.clickCount = 0;
+    }
+
+    testPlugin: function() {
+        return true
+    }
+
+    unload: function() {
+        console.log(i18n('"Tutorial6" plugin unloaded'))
+    }
+
+    populateWebViewMenu: function(menu, webHitTestResult) {
+        /* Directly add actions to the menu */
+        var action_always = menu.addAction({
+            text: 'Copy something to the clipboard',
+            icon: 'falkon'
+        })
+
+        action_always.triggered.connect(function() {
+            Falkon.Clipboard.copy('Something from Falkon extension')
+            console.log(i18n('"Tutorial6" Something was copied to the clipboard'))
+        })
+
+        if (webHitTestResult.isImage()) {
+            var action_image = menu.addAction({
+                text: 'Image, copy URL',
+                icon: 'falkon'
+            })
+
+            action_image.triggered.connect(function() {
+                Falkon.Clipboard.copy(webHitTestResult.imageUrl)
+                console.log(i18n('"Tutorial6" Surprise, this is an image with url: ' + webHitTestResult.imageUrl))
+            })
+        }
+    }
+
+}

qml/extensions/qml_tutorial_6/metadata.desktop

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+[Desktop Entry]
+Name=Tutorial6 QML
+Comment=Example QML extension context menu and clipboard
+Icon=
+Type=Service
+X-Falkon-Type=Extension/Qml
+
+X-Falkon-Author=Juraj Oravec
+X-Falkon-Email=jurajoravec@mailo.com
+X-Falkon-Version=1.0.0
+X-Falkon-Settings=false