More efficient sleeping

[ire4ever1190]

Taking a look at the code I am wondering why I am using polling for the tasks.

For async I can register a future when the queue is empty that I just complete when a new task is added (literally mimicing how I implemented the sleep cancelling for adding in new tasks)

For sync, thinking I could maybe add a conditional variable that I just await with a timer (TODO: Check how accurate the timer is). Might need to get the whole gcsafety working well first though