Add setting for self-looping doors

resources/app/cli/args.json

@@ -212,6 +212,10 @@
     "action": "store_true",
     "type": "bool"
   },
+  "door_self_loops": {
+    "action": "store_true",
+    "type": "bool"
+  },
   "experimental": {
     "action": "store_true",
     "type": "bool"

resources/app/cli/lang/en.json

@@ -253,6 +253,7 @@
       "strict:  Ensure small keys are available"
     ],
     "decoupledoors" : [ "Door entrances and exits are decoupled" ],
+    "door_self_loops" : [ "Spiral stairs are allowed to self-loop" ],
     "experimental": [ "Enable experimental features. (default: %(default)s)" ],
     "dungeon_counters": [ "Enable dungeon chest counters. (default: %(default)s)" ],
     "crystals_ganon": [