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}