Allow worlds to provide item and location descriptions (#2409)

These are displayed in the weighted options page as hoverable tooltips.

worlds/dark_souls_3/Items.py

@@ -1271,6 +1271,14 @@ _cut_content_items = [DS3ItemData(row[0], row[1], False, row[2]) for row in [
     ("Dorris Swarm",                        0x40393870, DS3ItemCategory.SKIP),
 ]]
 
+item_descriptions = {
+    "Cinders": """
+      All four Cinders of a Lord.
+
+      Once you have these four, you can fight Soul of Cinder and win the game.
+    """,
+}
+
 _all_items = _vanilla_items + _dlc_items
 
 item_dictionary = {item_data.name: item_data for item_data in _all_items}

worlds/dark_souls_3/__init__.py

@@ -7,7 +7,7 @@ from Options import Toggle
 from worlds.AutoWorld import World, WebWorld
 from worlds.generic.Rules import set_rule, add_rule, add_item_rule
 
-from .Items import DarkSouls3Item, DS3ItemCategory, item_dictionary, key_item_names
+from .Items import DarkSouls3Item, DS3ItemCategory, item_dictionary, key_item_names, item_descriptions
 from .Locations import DarkSouls3Location, DS3LocationCategory, location_tables, location_dictionary
 from .Options import RandomizeWeaponLevelOption, PoolTypeOption, dark_souls_options
 
@@ -60,6 +60,7 @@ class DarkSouls3World(World):
             "Cinders of a Lord - Lothric Prince"
         }
     }
+    item_descriptions = item_descriptions
 
 
     def __init__(self, multiworld: MultiWorld, player: int):