CiviCase dashboard/find case: Additional columns and filters needed

In order to improve the workflow, the following should be added to the find case / dashboard functionality of CiviCase:

New column: "Case_ID" -> with sorting

New filter: "Next Sched. assignee"

This should refer to the "Next Sched." actitivity from the list.
The filter list should contain "myself" as the first entry, and then should display all other assignee contained in the activities displayed on the case list.

This functionality should be available on:

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