New windowing system

Large commit that totally refactor of the way we handle the bar and
panels.

Testing should focus on Panels, Bar, Keyboard Focus, IPC calls.

Changes brief:
- One NFullScreenWindow per screen which handle it's bar and dedicated
panels.
- Added shadows
- Reintroduced dimming
- New panels animations
- Proper Z ordering
- Panels on overlay laywer is not reimplemented, if we do it then the
bar will be on the Overlay too
- Panel dragging was not reimplemented, to be discussed before
reimplementing
- Still a WIP, need to work more on shadows and polishing + debugging.

Modules/SetupWizard/SetupWizard.qml

@@ -14,17 +14,17 @@ NPanel {
   preferredHeight: 600 * Style.uiScaleRatio
   preferredWidthRatio: 0.4
   preferredHeightRatio: 0.6
+
   panelAnchorHorizontalCenter: true
   panelAnchorVerticalCenter: true
-  panelKeyboardFocus: true
-
-  // Prevent closing during setup
-  backgroundClickEnabled: false
-  draggable: false
 
   property int currentStep: 0
   property int totalSteps: 5
 
+  // Override Escape handler to prevent closing the setup wizard
+  function onEscapePressed() {// Do nothing - prevent ESC from closing the setup wizard
+  }
+
   // Setup wizard data
   property string selectedWallpaperDirectory: Settings.defaultWallpapersDirectory
   property string selectedWallpaper: ""
@@ -42,17 +42,6 @@ NPanel {
         anchors.margins: Style.marginXL
         spacing: Style.marginL
 
-        // Override ESC key to prevent closing during setup
-        Shortcut {
-          sequences: ["Escape"]
-          enabled: root.active
-          onActivated: {
-
-            // Do nothing - prevent ESC from closing the setup wizard
-          }
-          context: Qt.WindowShortcut
-        }
-
         // Step content - takes most of the space
         Item {
           Layout.fillWidth: true