Wallpaper refining (#81)

* Wallpaper refining

- Swww: allow all images formats supported by Swww but only show the one
we can render in the panel
- Fix: timer should be restarted when selecting a wallpaper
- Fix: avoid recomputing selected thumbnail by altering the border width
- Removed LazyLoader as it was not helping

* Wallpapers changes

- revert: maintaining a single list all wallpapers, support only basic
images format.
- settings: reordered wallpapers settings and made the Swww settings
conditionals to activating the useSWWW toggle

* Fix broken avatar display in Panel, Settings and LockScreen

---------

Co-authored-by: Sébastien Atoch <sebastien@atracktiv.com>

Components/Avatar.qml

@@ -7,6 +7,11 @@ import QtQuick.Effects
 Item {
     anchors.fill: parent
 
+    anchors.leftMargin: 2
+    anchors.rightMargin: 2
+    anchors.topMargin: 2
+    anchors.bottomMargin: 2
+
     IconImage {
         id: avatarImage
         anchors.fill: parent
@@ -18,7 +23,7 @@ Item {
     }
 
     MultiEffect {
-        anchors.fill: avatarImage
+        anchors.fill: parent
         source: avatarImage
         maskEnabled: true
         maskSource: mask
@@ -27,13 +32,11 @@ Item {
 
     Item {
         id: mask
-
-        anchors.fill: avatarImage
+        anchors.fill: parent
         layer.enabled: true
         visible: false
-
         Rectangle {
-            anchors.fill: avatarImage
+            anchors.fill: parent
             radius: avatarImage.width / 2
         }
     }