Tasks/background system

[lenisko]

Every time and CPU consuming operation should be placed on the task queue.

Few things to consider:

• On addition, unique task-id should be returned and saved to database along with input data and options we have chosen.
• Configuration option where we pick how many workers we would like to be spawned and process our tasks at once.
• New UI page with a list of currently queued tasks, passed arguments and maybe a few finished with results? Ability to cancel current job (kill), remove others.
• Button/API call with ability to skip queue - for example, when we process a small area and need a results asap.

In case of current implementations, it might be required to create two-way communication between Koji and Golbat / Dragonite - so when tasks are sent by Golbat, Koji would call it back with results. Otherwise, additional calls with task-id might be sent in a loop till we get an answer.