Reimplement --securerandom

Seeds should be reproducable without the flag passed, and unreproducable with the flag passed.
With --securerandom, generate a 9-char alphanumeric string to use to make filenames differ.

resources/app/cli/lang/en.json

@@ -2,7 +2,7 @@
   "cli": {
     "yes": "Yes",
     "no": "No",
-    "app.title": "ALttP Door Randomizer Version %s - Seed: %d, Code: %s",
+    "app.title": "ALttP Door Randomizer Version %s - Seed: %s, Code: %s",
     "version": "Version",
     "seed": "Seed",
     "player": "Player",