Show only specific extension file type in file manager list

[abhimanusharma]

Hi,

This is very powerful package with every functionality needed.
There are few configuration that would be awesome to have in this project.

1. It would be great if there is a way to show only specific filetype files in explorer.
2. It would be great to disable few features like download/edit/delete etc.
3. Drag and drop upload file on explorer view. (This is on upload file model but not mentioned to drop a file).
4. Default files view (List/Grid).
5. Add context menu option to perform a custom event.

This is just some suggestions for improvement.