Implement TASK queue

[soywiz]

Now that VitaOrganizer 0.2 supports unassisted promoting, and that you can upload a full game without any user interaction, it would be great to add a task queue to queue several games to be uploaded one after another.

That task queue could support interrupting/removing tasks.

[gordon0001]

also implement sometihng to manage tasks/queue, able to see the task queue, cancel tasks from queue, current task status