add basic inventory, fading walls

Assets/TestItem.prefab

@@ -12,7 +12,6 @@ GameObject:
   - component: {fileID: 4819581479575965518}
   - component: {fileID: 1199667423908831825}
   - component: {fileID: 3187412546555382564}
-  - component: {fileID: 7967411503437802021}
   - component: {fileID: 7654873247549649761}
   m_Layer: 0
   m_Name: TestItem
@@ -91,6 +90,7 @@ MeshRenderer:
   m_SortingLayerID: 0
   m_SortingLayer: 0
   m_SortingOrder: 0
+  m_MaskInteraction: 0
   m_AdditionalVertexStreams: {fileID: 0}
 --- !u!114 &3187412546555382564
 MonoBehaviour:
@@ -104,22 +104,8 @@ MonoBehaviour:
   m_Script: {fileID: 11500000, guid: e3bb397f7c2c8ee47bc71df7f8d491bf, type: 3}
   m_Name: 
   m_EditorClassIdentifier: 
-  item: {fileID: 7967411503437802021}
---- !u!114 &7967411503437802021
-MonoBehaviour:
-  m_ObjectHideFlags: 0
-  m_CorrespondingSourceObject: {fileID: 0}
-  m_PrefabInstance: {fileID: 0}
-  m_PrefabAsset: {fileID: 0}
-  m_GameObject: {fileID: 9072044991579024645}
-  m_Enabled: 1
-  m_EditorHideFlags: 0
-  m_Script: {fileID: 11500000, guid: aa43c795f1a58fa4785593558036d0b3, type: 3}
-  m_Name: 
-  m_EditorClassIdentifier: 
-  itemName: Star Shard
-  id: 1
-  maxStack: 10
+  itemId: 1
+  quantity: 1
 --- !u!135 &7654873247549649761
 SphereCollider:
   m_ObjectHideFlags: 0