1. [fix] haiwen#985
2.[modify] WRITE_EXTERNAL_STORAGE Modified to MANAGE_EXTERNAL_STORAGE in BrowserActivity
3. fix other bugs

Clicking on an Item of type "/" in an ActivityFragment will toast an internal server error.

1、Fix the bug: when you open the APP, you can't delete the data on the "Starred Files" page when you directly long-press and delete it.
2. Add star feature to the list of libraries.
3. Add star feature to folder list.
4、Folders and libraries on the starred page can be clicked to enter details.
5. Remove the client password feature on the settings page.
6. Modify the API and logic for deleting files/folders.
7. Modify the entity fields of library page, starred page and activity page.
8. Update NavContext class
9. Add storage permission check when entering the home page: different system versions request different storage permissions.

- Refactoring the SettingsFragment page
- Folder Backup: Add Skip Hidden Files Feature
- Add preview for sdoc format files
- Cleaning up useless code
- Add some util classes