settings: code clean up

Correct Layout and Anchors emplacement
Erase inutile code
Fix binding loop warnings
Replace magic numbers by JamiTheme values
Remove multiline comments from qml files

Change-Id: Icdde094750ccc39fa3b3c9fb9368f8609eb8981d
Gitlab: #5
diff --git a/src/mainview/components/ContactSearchBar.qml b/src/mainview/components/ContactSearchBar.qml
index ef75bbc..89fb42c 100644
--- a/src/mainview/components/ContactSearchBar.qml
+++ b/src/mainview/components/ContactSearchBar.qml
@@ -32,10 +32,8 @@
     }
 
 
-    /*
-     * Hack - there is no real way now to make TextField lose its focus,
-     * unless transfer it to other component.
-     */
+    // Hack - there is no real way now to make TextField lose its focus,
+    // unless transfer it to other component.
     function clearFocus() {
         fakeFocus.forceActiveFocus()
     }