Core: Update start inventory description to mention item quantities (#5460)

* SNIClient: new SnesReader interface

* fix Python 3.8 compatibility
`bisect_right`

* move to worlds
because we don't have good separation importable modules and entry points

* `read` gives object that contains data

* remove python 3.10 implementation and update typing

* remove obsolete comment

* freeze _MemRead and assert type of get parameter

* some optimization in `SnesData.get`

* pass context to `read` so that we can have a static instance of `SnesReader`

* add docstring to `SnesReader`

* remove unused import

* break big reads into chunks

* some minor improvements

- `dataclass` instead of `NamedTuple` for `Read`
- comprehension in `SnesData.__init__`
- `slots` for dataclasses

* Change descriptions

* Fix sni client?

---------

Co-authored-by: beauxq <beauxq@yahoo.com>
Co-authored-by: Doug Hoskisson <beauxq@users.noreply.github.com>

Options.py

@@ -1380,7 +1380,7 @@ class NonLocalItems(ItemSet):
 
 
 class StartInventory(ItemDict):
-    """Start with these items."""
+    """Start with the specified amount of these items. Example: "Bomb: 1" """
     verify_item_name = True
     display_name = "Start Inventory"
     rich_text_doc = True
@@ -1388,7 +1388,7 @@ class StartInventory(ItemDict):
 
 
 class StartInventoryPool(StartInventory):
-    """Start with these items and don't place them in the world.
+    """Start with the specified amount of these items and don't place them in the world. Example: "Bomb: 1"
 
     The game decides what the replacement items will be.
     """