TouchAppCreator v2.4

Here are TouchAppCreator v2.4 features:

1. Import App

2. New Quiz Element

3. New Slideshow Element

4. Search elements by keywords

5. Add link in markdown element

6. Support inline equation and horizontal line for paragraph element

7. Search apps by keywords

8. Change audio element to button mode

9. Better support for EPUB generated by Pages app

10. Import files from OneDrive

11. Add photo and video from Dropbox, OneDrive, Google Drive, Resource Library to gallery directly

12. Fix bug for clipboard