New Scheduler

[ortyomka]

Scheduler should be updated.

Several Problems:

• Two resources(active and planning) should be union, because we don’t have twice the resources.
• Current implementation theoretically prone to starvation
• We cannot disabling workers
• Unstable selection of workers

Suggestions:

• [ ] Each Worker should have separate queues
• [x] We can estimate how much time each worker spends on each task. It can help us processing tasks faster
• [ ] Disabling workers (blocks by separate queues)
• [ ] Resources union