logger: add a dedicated QML logging Singleton

- adds log.info/error/debug/warn/fatal
- adds ability to write logs to any file
- add CLI options in addition to env to set log levels

quickshell/Modals/ProcessListModal.qml

@@ -9,6 +9,7 @@ import qs.Widgets
 
 FloatingWindow {
     id: processListModal
+    readonly property var log: Log.scoped("ProcessListModal")
 
     property bool disablePopupTransparency: true
     property int currentTab: 0
@@ -22,7 +23,7 @@ FloatingWindow {
 
     function show() {
         if (!DgopService.dgopAvailable) {
-            console.warn("ProcessListModal: dgop is not available");
+            log.warn("dgop is not available");
             return;
         }
         visible = true;
@@ -36,7 +37,7 @@ FloatingWindow {
 
     function toggle() {
         if (!DgopService.dgopAvailable) {
-            console.warn("ProcessListModal: dgop is not available");
+            log.warn("dgop is not available");
             return;
         }
         visible = !visible;
@@ -44,7 +45,7 @@ FloatingWindow {
 
     function focusOrToggle() {
         if (!DgopService.dgopAvailable) {
-            console.warn("ProcessListModal: dgop is not available");
+            log.warn("dgop is not available");
             return;
         }
         if (visible) {