Allow sorting by estimated time in issues.
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### Problem to solve
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As a project manager i want to be able to sort my issues according to the estimated time as we will sometimes re-prioritize people between projects or on an end of week to do a simple task before going into a different issue the following week and starting fresh.
### Proposal
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Add a sort in the issues by estimated time.
Add a possibility of creating boards by estimated time and potentially weight (estimated time less than 1d, estimated time between 1d-5d, ect) Same for doing grouping by weight in the boards. I do understand this would mean that these boards would probably not allow drag-and-drop features as it is hard to do so but it would still be very valuable. Even if the boards dont get done the issue by estimated time would be a great value added!
### Further details
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### Links / references
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