Read sprite costume names from JSON, and write currentCostume to JSON

src/serialization/sb3.js

@@ -70,7 +70,7 @@ var parseScratchObject = function (object, runtime) {
             // @todo: Make sure all the relevant metadata is being pulled out.
             sprite.costumes.push({
                 skin: costume.skin,
-                name: costume.costumeName,
+                name: costume.name,
                 bitmapResolution: costume.bitmapResolution,
                 rotationCenterX: costume.rotationCenterX,
                 rotationCenterY: costume.rotationCenterY

src/sprites/rendered-target.js

@@ -719,6 +719,7 @@ RenderedTarget.prototype.toJSON = function () {
         direction: this.direction,
         costume: this.getCurrentCostume(),
         costumeCount: this.getCostumes().length,
+        currentCostume: this.currentCostume,
         visible: this.visible,
         rotationStyle: this.rotationStyle,
         blocks: this.blocks._blocks,