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/Menus/ConfigurationMenu/AutoConfiguration.qml

@@ -4,7 +4,7 @@
 import QtQuick 2.7
 import QtQuick.Controls 2.0
 
-import UM 1.3 as UM
+import UM 1.5 as UM
 import Cura 1.0 as Cura
 
 Item
@@ -12,14 +12,13 @@ Item
     width: parent.width
     height: childrenRect.height
 
-    Label
+    UM.Label
     {
         id: header
         text: catalog.i18nc("@header", "Configurations")
         font: UM.Theme.getFont("medium")
         color: UM.Theme.getColor("small_button_text")
         height: contentHeight
-        renderType: Text.NativeRendering
 
         anchors
         {

resources/qml/Menus/ConfigurationMenu/ConfigurationListView.qml

@@ -39,7 +39,7 @@ Item
             anchors.verticalCenter: parent.verticalCenter
             status: UM.StatusIcon.Status.WARNING
         }
-        Label
+        UM.Label
         {
             id: label
             anchors.left: icon.right
@@ -51,9 +51,6 @@ Item
             text: Cura.MachineManager.printerConnected ?
                     catalog.i18nc("@label", "Loading available configurations from the printer...") :
                     catalog.i18nc("@label", "The configurations are not available because the printer is disconnected.")
-            color: UM.Theme.getColor("text")
-            font: UM.Theme.getFont("default")
-            renderType: Text.NativeRendering
             wrapMode: Text.WordWrap
         }
     }