[Feature Request] add `send_immediately` to send "finished" status to trakt after watching >=80% to fix #202

[soredake]

If this option is added, #202 can be considered as fixed, as finished state will be sent before changing file.

[iamkroot]

My main hesitancy with this is how to deduplicate the scrobbles. If we've already added it to history at 80% and then continue watching we need to remember not to scrobble again. And this needs to be persisted across many plays (you can close a file at 85%, come back tomorrow and play the rest of it.) Makes the logic a lot more complicated than what it is today.

If someone is willing to contribute with a simple PR, I'm willing to review.