Deleting multiple tasks at once

[Glitchy-Tozier]

I'd like to suggest a helpful feature: The ability to delete multiple tasks at once.

After a while, an impressive backlog of completed tasks builds up, and deleting each one of them would take minutes of opening each one of them separately, and then deleting them individually.

Suggestion: Add one or more of the following:

• Add option to automatically delete tasks after, say, 1 week.
• Add option "delete all completed tasks"
• Add a way to go into some kind of selection-mode, where the user is able to select multiple tasks at once before deleting them.

The first option is the most elegant, in my opinion.
The third option is a nice addition and might be used in other ways as well: for example, for ticking/unticking/relocating tasks to another list.

Screenshot of the issue