Core: add race mode to multidata and datastore (#4017)

* add race mode to multidata and datastore

* have commonclient check race mode on connect and add it to the tooltip ui

CommonClient.py

@@ -325,6 +325,7 @@ class CommonContext:
             "collect": "disabled",
             "remaining": "disabled",
         }
+        self.race_mode: int = 0
 
         # own state
         self.finished_game = False
@@ -454,6 +455,7 @@ class CommonContext:
         if kwargs:
             payload.update(kwargs)
         await self.send_msgs([payload])
+        await self.send_msgs([{"cmd": "Get", "keys": ["race_mode"]}])
 
     async def console_input(self) -> str:
         if self.ui: