Adds mice (#3594)

* Initial

* Mmm

* Adds them to map

* Makes mice grindable

* meta.json looking nice

* Mice go squeak

* Ye

* E

* Review

* Update Content.Server/GameObjects/Components/Mobs/Speech/MouseAccentComponent.cs

Co-authored-by: Paul Ritter <ritter.paul1@googlemail.com>

Content.Client/IgnoredComponents.cs

@@ -243,6 +243,8 @@ namespace Content.Client
             "Shovel",
             "ReagentTank",
             "UtilityAI",
+            "MouseAccent",
+            "GhostTakeoverAvailable",
             "GhostRoleMobSpawner",
         };
     }