QML bindings for QuickSceneEffect

At the moment, if you want to write a qtquick effect, you need to write some amount of C++ code. This is a problem because libkwineffects is unstable and you cannot simply upload your effect to store dot kde dot org and let users install it using GHNS.

We need bindings for various things such as QuickSceneEffect, QuickSceneView, global shortcuts, global gestures, and KConfigXT.

An example qtquick effect may look as follows

import org.kde.kwin 3.0 as KWinComponents

KWinComponents.SceneEffect {
    id: effect

    /* If running is true, scene views will be created;
     * if running is false, scene views will be destroyed
     */
    running: false

    KWinComponents.Config {
        id: config
        key: "MyEffect"
        property bool showMinimizedWindows: false
    }

    KWinComponents.GlobalShortcutHandler {
        key: "Activate"
        description: i18n("Activate my effect")
        shortcuts: mykeys
        defaultShortcuts: mykeys
        onTriggered: effect.running = true;
    }

    KWinComponents.GlobalGestureHandler {
        type: KWinComponents.GlobalGestureHandler.SwipeUp
        fingerCount: 42
        onMoved: ...
        onCancelled: ...
    }

    view: KWinComponents.SceneView {
        KWinComponents.WindowHeap { ... }
    }
}

Disclaimer: The provided example above is purely for demonstration purposes