Fix: Save account error was because in constructor type did not end in underscore

Fix: Employee save as checking for in None instead of is None

Feature: Checking the existing token for validity in constructor of auth service, this should prevent last login showing
Feature: Moved the middleware secret key into the env file

Chore: Replaced my own GUID() with postgres UUID() type

overlord/package.json

@@ -1,6 +1,6 @@
 {
   "name": "overlord",
-  "version": "7.0.2",
+  "version": "7.0.3",
   "scripts": {
     "ng": "ng",
     "start": "ng serve",