1.8.1

• Implement DestroyImmediateAllTypeObjectInScene util function in JCS_Uility module.
• Increase the preformance of the removing pause action from the pause manager.
  The time complexity increase from O(n^2) to O(n).
• Add test option and null sprite after done playing animation option to JCS_2DAnimation module.
• Add clear all undo/redo comps and all undo/redo history, in JCS_UndoRedoSystem and
  JCS_UndoRedoComponent class for undo redo module and easier function API call.
• Add there is undo redo history check API.
• Rename undo/redo system's API function call => start/stop recording to start/stop recording all.
• Organize code and add class desciption if the class do not have one.
• Update Unity Engine version to 2018.2.8f1.
• Rename from JCS_AspectScreenPanel to JCS_ResizableScreenPanel, I think this is
  the proper naming, using 'resizable' than the word 'aspect'.
• Remove JCS_AspectScreen and move the functionalities to JCS_ScreenManager.