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/SessionMenu/SessionMenu.qml

@@ -15,9 +15,9 @@ NPanel {
 
   preferredWidth: 400 * Style.uiScaleRatio
   preferredHeight: 340 * Style.uiScaleRatio
+
   panelAnchorHorizontalCenter: true
   panelAnchorVerticalCenter: true
-  panelKeyboardFocus: true
 
   // Timer properties
   property int timerDuration: 9000 // 9 seconds
@@ -148,6 +148,52 @@ NPanel {
     }
   }
 
+  // Override keyboard handlers from NPanel
+  function onEscapePressed() {
+    if (timerActive) {
+      cancelTimer()
+    } else {
+      cancelTimer()
+      close()
+    }
+  }
+
+  function onTabPressed() {
+    selectNextWrapped()
+  }
+
+  function onShiftTabPressed() {
+    selectPreviousWrapped()
+  }
+
+  function onUpPressed() {
+    selectPreviousWrapped()
+  }
+
+  function onDownPressed() {
+    selectNextWrapped()
+  }
+
+  function onReturnPressed() {
+    activate()
+  }
+
+  function onHomePressed() {
+    selectFirst()
+  }
+
+  function onEndPressed() {
+    selectLast()
+  }
+
+  function onCtrlJPressed() {
+    selectNextWrapped()
+  }
+
+  function onCtrlKPressed() {
+    selectPreviousWrapped()
+  }
+
   // Countdown timer
   Timer {
     id: countdownTimer
@@ -165,81 +211,6 @@ NPanel {
     id: ui
     color: Color.transparent
 
-    // Keyboard shortcuts
-    Shortcut {
-      sequence: "Ctrl+K"
-      onActivated: ui.selectPreviousWrapped()
-      enabled: root.opened
-    }
-
-    Shortcut {
-      sequence: "Ctrl+J"
-      onActivated: ui.selectNextWrapped()
-      enabled: root.opened
-    }
-
-    Shortcut {
-      sequence: "Up"
-      onActivated: ui.selectPreviousWrapped()
-      enabled: root.opened
-    }
-
-    Shortcut {
-      sequence: "Down"
-      onActivated: ui.selectNextWrapped()
-      enabled: root.opened
-    }
-
-    Shortcut {
-      sequence: "Shift+Tab"
-      onActivated: ui.selectPreviousWrapped()
-      enabled: root.opened
-    }
-
-    Shortcut {
-      sequence: "Tab"
-      onActivated: ui.selectNextWrapped()
-      enabled: root.opened
-    }
-
-    Shortcut {
-      sequence: "Home"
-      onActivated: ui.selectFirst()
-      enabled: root.opened
-    }
-
-    Shortcut {
-      sequence: "End"
-      onActivated: ui.selectLast()
-      enabled: root.opened
-    }
-
-    Shortcut {
-      sequence: "Return"
-      onActivated: ui.activate()
-      enabled: root.opened
-    }
-
-    Shortcut {
-      sequence: "Enter"
-      onActivated: ui.activate()
-      enabled: root.opened
-    }
-
-    Shortcut {
-      sequence: "Escape"
-      onActivated: {
-        if (timerActive) {
-          cancelTimer()
-        } else {
-          cancelTimer()
-          root.close()
-        }
-      }
-      context: Qt.WidgetShortcut
-      enabled: root.opened
-    }
-
     // Navigation functions
     function selectFirst() {
       root.selectFirst()