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This changes the ESP32 WDT implementation to use a custom handle so that it becomes possible to reset the WDT from a thread. By default esp_task_wdt_add subscribes the task_id of the current task. That means that if we're running in a different task we are unable to reset the WDT, which prevents feeding the WDT from a thread directly, or even from a timer (which may randomly run in a different task when there's multiple threads). As an added bonus, the name we set makes the error clearly specify that it was the user-specified WDT that reset the chip. Signed-off-by: Daniël van de Giessen <daniel@dvdgiessen.nl>