Add some compatibility extensions to theme and unit

- This allows us to use these new things without changing much in our
  own code, things now work again.

Signed-off-by: Sebastian Kügler <sebas@kde.org>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

qt-mobile/main.qml

@@ -17,10 +17,14 @@ ApplicationWindow {
 
 	Theme.Units {
 		id: units
+		property int spacing: Math.ceil(gridUnit / 3)
 	}
 
 	Theme.Theme {
 		id: theme
+		/* Added for subsurface */
+		property color accentColor: "#2d5b9a"
+		property color accentTextColor: "#ececec"
 	}
 
 	Menu {

qt-mobile/theme/Theme.qml

@@ -54,5 +54,4 @@ QtObject {
     property color complementaryBackgroundColor: Qt.rgba(0,0,0, 0.54)
     property color complementaryHoverColor: "#2196F3"
     property color complementaryFocusColor: "#2196F3"
-
 }