Core: Allow world to display their valid keys in yaml templates

Options.py

@@ -785,6 +785,7 @@ class VerifyKeys(metaclass=FreezeValidKeys):
     verify_item_name: bool = False
     verify_location_name: bool = False
     value: typing.Any
+    display_valid_keys: bool = False  # Should the full list of keys appear in templates
 
     @classmethod
     def verify_keys(cls, data: typing.Iterable[str]) -> None:

data/options.yaml

@@ -63,6 +63,10 @@ requires:
     #
     {%- endif -%}
 
+    {%- if option.valid_keys is defined and option.display_valid_keys %}
+    # Valid keys are {{ option.valid_keys }}
+    {%- endif -%}
+
     {%- if option.range_start is defined and option.range_start is number %}
     {{- range_option(option) -}}
 

worlds/stardew_valley/options.py

@@ -682,6 +682,7 @@ class Mods(OptionSet):
     """List of mods that will be included in the shuffling."""
     internal_name = "mods"
     display_name = "Mods"
+    display_valid_keys = True
     valid_keys = {
         ModNames.deepwoods, ModNames.tractor, ModNames.big_backpack,
         ModNames.luck_skill, ModNames.magic, ModNames.socializing_skill, ModNames.archaeology,