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/MonitorStage/MonitorMain.qml

@@ -132,7 +132,7 @@ Rectangle
                 width: UM.Theme.getSize("icon_indicator").width
                 height: UM.Theme.getSize("icon_indicator").height
             }
-            Label
+            UM.Label
             {
                 id: manageQueueText
                 anchors
@@ -144,7 +144,6 @@ Rectangle
                 color: UM.Theme.getColor("text_link")
                 font: UM.Theme.getFont("medium")
                 text: catalog.i18nc("@label link to technical assistance", "View user manuals online")
-                renderType: Text.NativeRendering
             }
             MouseArea
             {
@@ -155,14 +154,13 @@ Rectangle
                 onExited: manageQueueText.font.underline = false
             }
         }
-        Label
+        UM.Label
         {
             id: noConnectionLabel
             anchors.horizontalCenter: parent.horizontalCenter
             visible: !isNetworkConfigurable
             text: catalog.i18nc("@info", "In order to monitor your print from Cura, please connect the printer.")
             font: UM.Theme.getFont("medium")
-            color: UM.Theme.getColor("text")
             wrapMode: Text.WordWrap
             width: contentWidth
         }