Turn switching events.

[BeekeeperAlex]

I would like to add an event when the turn has switched. This would allow tournament broadcasters to build apps that automatically switch camera perspectives based on whose turn it is.

This may be difficult because there is no log entry directly representing a turn switch and card draws in friendly/opposing zones are not 1:1 with who's turn it is. For example, I could hit my enemy's Acolyte of Pain and draw my enemy a card while it's still my turn.

[KennethSundqvist]

It's not that hard to detect turn changes actually and I have a quite solid implementation of it here: https://github.com/EvilOatmeal/hearthstone-log-watcher/tree/turn-events

However the current implementation of card changes (the zone-change event of this module) does not account for action queueing so the card events can be out of order with the turn events. See issue #11.