Bug fixes and sorting issue with loadFromFlattenedJson

Also added several new test cases, most significantly some cases that test the commit functionality

package.json

@@ -1,6 +1,6 @@
 {
   "name": "scorm-again",
-  "version": "1.4.1",
+  "version": "1.4.2",
   "description": "A modern SCORM JavaScript run-time library for AICC, SCORM 1.2, and SCORM 2004",
   "main": "dist/scorm-again.min.js",
   "directories": {
@@ -38,7 +38,9 @@
     "mocha": "^8.1.1",
     "mocha-junit-reporter": "^2.0.0",
     "mochawesome": "^6.1.1",
-    "nyc": "^15.1.0"
+    "nyc": "^15.1.0",
+    "fetch-pretender": "^1.5.0",
+    "sinon": "^9.0.3"
   },
   "scripts": {
     "test": "./node_modules/.bin/mocha --require @babel/register --bdd --recursive --reporter list",