Multiple Register operations can now be called in a single recipe

src/core/ChefWorker.js

@@ -92,7 +92,7 @@ async function bake(data) {
     } catch (err) {
         self.postMessage({
             action: "bakeError",
-            data: err.message
+            data: err.message.split(":").slice(1).join(":").slice(1) // Cut off worker blurb
         });
     }
 }
@@ -182,13 +182,15 @@ self.setOption = function(option, value) {
  * Send register values back to the app.
  *
  * @param {number} opIndex
+ * @param {number} numPrevRegisters
  * @param {string[]} registers
  */
-self.setRegisters = function(opIndex, registers) {
+self.setRegisters = function(opIndex, numPrevRegisters, registers) {
     self.postMessage({
         action: "setRegisters",
         data: {
             opIndex: opIndex,
+            numPrevRegisters: numPrevRegisters,
             registers: registers
         }
     });