Core: Add "OptionCounter", use it for generic "StartInventory" and Witness "TrapWeights" (#3756)

* CounterOption

* bring back the negative exception for ItemDict

* Backwards compatibility

* ruff on witness

* fix in calls

* move the contains

* comment

* comment

* Add option min and max values for CounterOption

* Use min 0 for TrapWeights

* This is safe now

* ruff

* This fits on one line again now

* OptionCounter

* Update Options.py

* Couple more typing things

* Update Options.py

* Make StartInventory work again, also make LocationCounter theoretically work

* Docs

* more forceful wording

* forced line break

* Fix unit test (that wasn't breaking?)

* Add trapweights to witness option presets to 'prove' that the unit test passes

* Make it so you can order stuff

* Update macros.html

Utils.py

@@ -429,6 +429,9 @@ class RestrictedUnpickler(pickle.Unpickler):
     def find_class(self, module: str, name: str) -> type:
         if module == "builtins" and name in safe_builtins:
             return getattr(builtins, name)
+        # used by OptionCounter
+        if module == "collections" and name == "Counter":
+            return collections.Counter
         # used by MultiServer -> savegame/multidata
         if module == "NetUtils" and name in {"NetworkItem", "ClientStatus", "Hint",
                                              "SlotType", "NetworkSlot", "HintStatus"}: