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/PrintSetupSelector/Recommended/RecommendedInfillDensitySelector.qml

@@ -133,7 +133,6 @@ Item
                             visible: (index % 20) == 0 // Only show steps of 20%
                             anchors.horizontalCenter: parent.horizontalCenter
                             y: UM.Theme.getSize("thin_margin").height
-                            renderType: Text.NativeRendering
                             color: UM.Theme.getColor("quality_slider_available")
                         }
                     }

resources/qml/PrintSetupSelector/Recommended/RecommendedQualityProfileSelector.qml

@@ -4,7 +4,7 @@
 import QtQuick 2.10
 import QtQuick.Controls 2.3
 
-import UM 1.2 as UM
+import UM 1.5 as UM
 import Cura 1.6 as Cura
 import ".."
 
@@ -111,7 +111,7 @@ Item
                 }
                 height: intentCategoryLabel.height
 
-                Label
+                UM.Label
                 {
                     id: intentCategoryLabel
                     text: model.name
@@ -119,8 +119,6 @@ Item
                     anchors.left: parent.left
                     anchors.leftMargin: UM.Theme.getSize("section_icon").width + UM.Theme.getSize("narrow_margin").width
                     font: UM.Theme.getFont("medium")
-                    color: UM.Theme.getColor("text")
-                    renderType: Text.NativeRendering
                     elide: Text.ElideRight
                 }