C# API wrapping fix: BalloonPopupStyleMargins getters were not wrapped as properties
!value_type(carto::BalloonPopupMargins, styles.BalloonPopupMargins)
+%attribute(carto::BalloonPopupMargins, int, Left, getLeft)
+%attribute(carto::BalloonPopupMargins, int, Right, getRight)
+%attribute(carto::BalloonPopupMargins, int, Top, getTop)
+%attribute(carto::BalloonPopupMargins, int, Bottom, getBottom)
+
!polymorphic_shared_ptr(carto::BalloonPopupStyle, styles.BalloonPopupStyle)
%attributeval(carto::BalloonPopupStyle, carto::Color, BackgroundColor, getBackgroundColor)
