Expose the Window interface to QML

If we are designing our UI's windows from QML, it makes sense that we
might want to configure how they're placed from the same place.

Everything was already in place but for a few technical bits which this
change adds.

Signed-off-by: Victoria Fischer <victoria.fischer@mbition.io>

tests/quicktest.qml

@@ -0,0 +1,110 @@
+/*
+ *   SPDX-FileCopyrightText: 2021 Aleix Pol Gonzalez <aleix.pol_gonzalez@mercedes-benz.com>
+ *
+ *   SPDX-License-Identifier: LGPL-3.0-or-later
+ */
+
+import QtQuick 2.15
+import org.kde.layershell 1.0 as LayerShell
+
+Item
+{
+    Text {
+        text: "A normal Window"
+        anchors.centerIn: parent
+    }
+
+    Window {
+        LayerShell.Window.anchors: LayerShell.Window.AnchorLeft
+        LayerShell.Window.layer: LayerShell.Window.LayerBackground
+        LayerShell.Window.exclusionZone: -1
+
+        width: 200
+        height: 150
+        Rectangle {
+            anchors.fill: parent
+            color: "green"
+
+            Text {
+                anchors.centerIn: parent
+                text: "left bg"
+            }
+        }
+        visible: true
+    }
+
+
+    Window {
+        LayerShell.Window.scope: "dock"
+        LayerShell.Window.anchors: LayerShell.Window.AnchorLeft
+        LayerShell.Window.layer: LayerShell.Window.LayerTop
+        LayerShell.Window.exclusionZone: width
+
+        width: 100
+        height: 100
+        Rectangle {
+            anchors.fill: parent
+            color: "red"
+
+            Text {
+                anchors.centerIn: parent
+                text: "left"
+            }
+        }
+        visible: true
+    }
+
+    Window {
+        LayerShell.Window.scope: "normal"
+        LayerShell.Window.anchors: LayerShell.Window.AnchorRight
+
+        width: 100
+        height: 100
+        Rectangle {
+            anchors.fill: parent
+            color: "red"
+
+            Text {
+                anchors.centerIn: parent
+                text: "right"
+            }
+        }
+        visible: true
+    }
+
+    Window {
+        LayerShell.Window.scope: "normal"
+        LayerShell.Window.anchors: LayerShell.Window.AnchorTop
+
+        width: 100
+        height: 100
+        Rectangle {
+            anchors.fill: parent
+            color: "red"
+
+            Text {
+                anchors.centerIn: parent
+                text: "top"
+            }
+        }
+        visible: true
+    }
+
+    Window {
+        LayerShell.Window.scope: "normal"
+        LayerShell.Window.anchors: LayerShell.Window.AnchorBottom
+
+        width: 100
+        height: 100
+        Rectangle {
+            anchors.fill: parent
+            color: "red"
+
+            Text {
+                anchors.centerIn: parent
+                text: "bottom"
+            }
+        }
+        visible: true
+    }
+}