Feature request: Add task switcher support.

[ghost]

On Android 10 and newer, the task switcher is directly built into the launcher (the "default" task switcher is gone).
This means that if you try to use TL in a ROM without other launchers, the overview button will do nothing and in some cases, bootloop.
My request is to add a task switcher. You can just use the same layout as the main screen, put an "X" on the right, and add a "---CLOSE ALL---" entry on the top, which closes all tasks.