Estimate time for action based on historical executions

[jamesread]

I need to break this issue down into it's constituent parts - I've just added kill support which will make the next release very shortly, so I'm going to remove "kill button" from the issue title. I'm also going to drop the progress bar support into a new issue, and name it more like "estimated time". This would need log support and a few other things.

Therefore, this issue will be used to track "Live command output" - which is what a lot of people would like to see.

Originally posted by @jamesread in #43 (comment)

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If OliveTin can estimate the time for actions based on historical executions, then it would be possible to render progress bars.