V1.4.0-20190315

New Features

Improvements

- - The functions of adding Office files, images, videos and GIF are merged into one function of adding files.
  - The Excel table can display all the columns during solution editing and the table will be generated again right at the first second after the table height is adjusted.
  - Local upgrade of terminals

Fixed Problems

Problem	Cause
An error is reported occasionally while adding or clicking media.	The judgement logic of the remember property function is wrong.
Text in some fonts cannot be aligned.	Decimal points are ignored while drawing font position.
The duration of a solution with audio cannot be changed after the duration is set to 0.	The judgement on whether the solution has audio is wrong.

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