make ModuleState abstract to avoid trouble with the type of reference to its Module

Assets/Engine/Assets/Prefabs/Generic Module.prefab

@@ -92,7 +92,6 @@ GameObject:
   serializedVersion: 6
   m_Component:
   - component: {fileID: 7860513085978939562}
-  - component: {fileID: 4604142456167599783}
   m_Layer: 0
   m_Name: Generic Module
   m_TagString: Untagged
@@ -116,18 +115,6 @@ Transform:
   m_Father: {fileID: 0}
   m_RootOrder: 0
   m_LocalEulerAnglesHint: {x: 0, y: 0, z: 0}
---- !u!114 &4604142456167599783
-MonoBehaviour:
-  m_ObjectHideFlags: 0
-  m_CorrespondingSourceObject: {fileID: 0}
-  m_PrefabInstance: {fileID: 0}
-  m_PrefabAsset: {fileID: 0}
-  m_GameObject: {fileID: 3864228228344123331}
-  m_Enabled: 1
-  m_EditorHideFlags: 0
-  m_Script: {fileID: 11500000, guid: efdc32c450f7411385748449459a17b4, type: 3}
-  m_Name: 
-  m_EditorClassIdentifier: 
 --- !u!1 &4439105426094897912
 GameObject:
   m_ObjectHideFlags: 0