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

docs/options api.md

@@ -352,8 +352,15 @@ template. If you set a [Schema](https://pypi.org/project/schema/) on the class w
 options system will automatically validate the user supplied data against the schema to ensure it's in the correct
 format.
 
+### OptionCounter
+This is a special case of OptionDict where the dictionary values can only be integers.  
+It returns a [collections.Counter](https://docs.python.org/3/library/collections.html#collections.Counter).
+This means that if you access a key that isn't present, its value will be 0.  
+The upside of using an OptionCounter (instead of an OptionDict with integer values) is that an OptionCounter can be
+displayed on the Options page on WebHost.
+
 ### ItemDict
-Like OptionDict, except this will verify that every key in the dictionary is a valid name for an item for your world.
+An OptionCounter that will verify that every key in the dictionary is a valid name for an item for your world.
 
 ### OptionList
 This option defines a List, where the user can add any number of strings to said list, allowing duplicate values. You