Reset CB pointer and output on run

Added the code box's pointer and output to the things reset when
ParseCodeBox is ran.

starfish.js

@@ -82,7 +82,10 @@ class CodeBox {
      * Transforms the textual code box into usable matrix
      */
     ParseCodeBox() {
+        // Reset some field for a clean run
         this.box = [];
+        this.pointer = [0, 0];
+        this.outputDOM.value = "";
 
         const cbRaw = this.codeBoxDOM.value;
         const rows = cbRaw.split("\n").filter((r) => r.length);