Feature: Empty instead of delete a useful directory.

[zhangsean]

Feature: Empty instead of delete a useful directory.

Some useful directories have a lot of large files, e.g. logs.
I usually empty the logs directory but don't delete it, becuse the application uses the logs directory all the time, delete the logs directory may cause application errors.

If this feature is acceptable, I will push a PR for this.

[dundee]

Hello, zhangsean,
how would you like to implement it? Adding another button to the deletion dialog?

[zhangsean]

Add a shortcut key `e` mapping for empty a directory, just like shortcut key `d` mapping for deleting a directory.

[dundee]

Great, I think it will be a nice addition.