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

plugins/Marketplace/resources/qml/LicenseDialog.qml

@@ -42,16 +42,13 @@ UM.Dialog
                 source: UM.Theme.getIcon("Certificate", "high")
             }
 
-            Label
+            UM.Label
             {
                 text: catalog.i18nc("@text", "Please read and agree with the plugin licence.")
-                color: UM.Theme.getColor("text")
                 font: UM.Theme.getFont("large")
                 anchors.verticalCenter: icon.verticalCenter
                 height: UM.Theme.getSize("marketplace_large_icon").height
                 verticalAlignment: Qt.AlignmentFlag.AlignVCenter
-                wrapMode: Text.Wrap
-                renderType: Text.NativeRendering
             }
         }