Initial commit with a mostly working engine.

Basic commands are being parsed. I think the only weird part is the
'use' command because it needs to possibly target two things. A tiny
test example is provided in __main__, this will probably be broken out
later.

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

agame/room.py

@@ -0,0 +1,46 @@
+import dataclasses
+from typing import MutableMapping, Optional, Sequence, Union, TYPE_CHECKING
+from agame.item import ItemInst
+from agame.util import search_item_name
+
+
+__all__ = ("Room",)
+
+
+@dataclasses.dataclass
+class Room:
+    id: str
+    name: str
+    desc: str
+    items: MutableMapping[str, ItemInst]
+
+    def __init__(
+        self,
+        id: str,
+        name: str,
+        desc: str,
+        items: Union[Sequence[ItemInst], MutableMapping[str, ItemInst]],
+    ):
+        self.id = id
+        self.name = name
+        self.desc = desc
+        if isinstance(items, MutableMapping):
+            self.items = items
+        else:
+            self.items = {item.id: item for item in items}
+
+    def search_item_name(self, item_name: str) -> Optional[ItemInst]:
+        """
+        Searches all item instances in the room for the given item name, also
+        checking synonyms. Returns the first item instance found, or none if no
+        synonyms or names were found to match.
+        """
+        return search_item_name(self.items.values(), item_name)
+
+    def remove(self, item_id: str) -> Optional[ItemInst]:
+        """
+        Removes an item with the given ID from the room, returning it.
+
+        If it's not present in the room, `None` is returned.
+        """
+        return self.items.pop(item_id, None)