bookmarks whether to accept PR？

[imyuanx]

Discussed in #509

^{Originally posted by yunying1 January 26, 2022}
I hope show Clear From All Files in side bar, I have some code give bookmarks, But i not have bookmarks-core so I can't test and i don't know bookmarks whether to accept PR, So i'll submit it first but it's up to you.
Thanks, Great job.

PR: https://github.com/alefragnani/vscode-bookmarks/pull/508

[alefragnani]

As discussed in #509, a new issue to propose the new feature must be opened, and previously discussed.