Render labels using Text.QtRendering on OSX

Fonts were looking a bit to thick on when using `Text.NativeRendering`, so using `Text.QtRendering` instead. After this the font weight looks identical to figma (as far as I can see).

In this commit I also changed all `Label`'s to `UM.Label`'s and removed default properties where I could.

CURA-9154

resources/qml/ApplicationSwitcher/ApplicationButton.qml

@@ -82,7 +82,6 @@ Button
 
             height: base.height - applicationIcon.height - 2 * UM.Theme.getSize("default_margin").width  // Account for the top and bottom margins
             horizontalAlignment: Text.AlignHCenter
-            wrapMode: Text.Wrap
             elide: Text.ElideRight
         }
     }