Add ability to delete files

[srwi]

Preflight Checklist

• [X] I have searched all open and closed issues for the same feature request without success.

Problem Description

The user might want to delete files right from EverythingToolbar.

Proposed Solution

Add a context menu entry to delete a file.

Alternatives Considered

It is currently only possible to delete files via the system context menu.

Additional Information

Ticket created as part of discussion #311.