Werk #8090: Report scheduler - automatically email reports on a regular base

The new reporting scheduler allows users to have reports emailed at regular intervals. The scheduler is available for admins and normal users. Normal users can only mail reports to themselves.

Currently the schedule can be daily, weekly or monthly, where you can configure the time of day and the relative day in the week or month.

The scheduler allows to specify contexts for reports that need a context. For example you can use the shipped example report Report of host and specify the host to report about directly in the scheduler.

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