Add List Spacing to json parsing (not actually implemented)

Author: ivan-trackman

Editor/Interface/Figma.Types.cs

@@ -528,6 +528,7 @@ public class Style
                 public Paint[] fills;
                 public Dictionary<string, double> opentypeFlags;
                 public number? lineHeightPx;
+                public number? listSpacing;
                 public number? lineHeightPercent;
                 public number? lineHeightPercentFontSize;
                 public string lineHeightUnit;