Added saving of buildings

Assets/Scenes/SampleScene.unity

@@ -1806,7 +1806,9 @@ MonoBehaviour:
   BuildingManager: {fileID: 2005593405}
   CurrentMouseClickStrength: 0
   GridPosition: {x: 0, y: 0}
-  SelectedBuildingToBuild: {fileID: 0}
+  SelectedBuildingToBuild:
+    Name: 
+    Prefab: {fileID: 0}
   FlipCurrentBuilding: 0
 --- !u!58 &1330313879
 CircleCollider2D:
@@ -2403,6 +2405,7 @@ MonoBehaviour:
   m_Script: {fileID: 11500000, guid: 9b26cbb6d9a64e44ad6f1b2022ed62fe, type: 3}
   m_Name: 
   m_EditorClassIdentifier: 
+  Registry: {fileID: 11400000, guid: e6ae3d283005f994da00a3d8835a3cb5, type: 2}
 --- !u!1 &2026916297
 GameObject:
   m_ObjectHideFlags: 0
@@ -2810,16 +2813,7 @@ MonoBehaviour:
   MenuGrid: {fileID: 1484797012}
   MenuItemPrefab: {fileID: 1541142508120997748, guid: 74aff4063df1fab4c954bebfad022ff5,
     type: 3}
-  BuildingPrefabs:
-  - Name: Fan
-    Prefab: {fileID: 8624048914473773482, guid: 1b5c88b3f8d08674a9b15155d6ba9a36,
-      type: 3}
-  - Name: Wall
-    Prefab: {fileID: 1970033728917450326, guid: 3492b31295b69c148bb5a0660e598878,
-      type: 3}
-  - Name: Stair
-    Prefab: {fileID: 2132872997366704715, guid: 3cf8228c3f6c43d4cb60319693b11828,
-      type: 3}
+  BuildingPrefabs: {fileID: 11400000, guid: e6ae3d283005f994da00a3d8835a3cb5, type: 2}
 --- !u!1660057539 &9223372036854775807
 SceneRoots:
   m_ObjectHideFlags: 0