Advanced Workspace Switcher Widget + Lockscreen Virtual Keyboard (#149)

* Virtual keyboard on lockscreen

Almost whole code was taken from https://github.com/LucasCodingM/customVirtualkeyboard

* AdvancedWorkspaceSwitcher + BottomBar

- AdvancedWorkspaceSwitcher shows opened apps and allows to move to
them
- focusWindow function for niri
- Bottom bar with AdvancedWorkspaceSwitcher

* Cleanup + Styling fixes

* Changed visibility defaults back to true

For advanced workspace switcher

* Formatting + resolved commets

Modules/Lock/KeyboardController.qml

@@ -0,0 +1,36 @@
+import QtQuick
+
+Item {
+    id: keyboard_controller
+
+    // reference on the TextInput
+    property Item target
+    //Booléan on the state of the keyboard
+    property bool isKeyboardActive: false
+
+    property var rootObject
+
+    function show() {
+        if (!isKeyboardActive && keyboard === null) {
+            keyboard = keyboardComponent.createObject(keyboard_controller.rootObject);
+            keyboard.target = keyboard_controller.target;
+            isKeyboardActive = true;
+        } else
+            console.info("The keyboard is already shown");
+    }
+
+    function hide() {
+        if (isKeyboardActive && keyboard !== null) {
+            keyboard.destroy();
+            isKeyboardActive = false;
+        } else
+            console.info("The keyboard is already hidden");
+    }
+
+    // private
+    property Item keyboard: null
+    Component {
+        id: keyboardComponent
+        Keyboard {}
+    }
+}