Django-plans-payments

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* do not check whether a confirmed payment of a completed order is left anymore

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* migrate to `RecurringUserPlan.renewal_triggered_by`
* add `renewal_triggered_by` parameter to `Payment.set_renew_token`
* deprecate `automatic_renewal` parameter of `Payment.set_renew_token`; use `renewal_triggered_by` parameter instead
* deprecate `None` value of `renewal_triggered_by` parameter of `Payment.set_renew_token`; set an `AbstractRecurringUserPlan.RENEWAL_TRIGGERED_BY` instead

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* fix typo in payment description

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* add optional returning orders when payments are refunded

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* add change_reason for django-simple-history

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* specify sender=Payment for change_payment_status receiver