Add a "show hitboxes" option in replay client.

There is a bunch of missing shit in the replay system. It's basically a half finished project that's been put off for years. Seriously, why is it missing so many things that should have been in from the start?

I want to be able to tell when a Thresh hook actually should hit or not because when it phases through a minion I get a bit confused.

The "show hitboxes" feature would show ability hitboxes and champion hurtboxes, but later when they decide to finish the replay system hopefully they add the ability to show minion and monster hurtboxes as well.

Thanks for listening to my replay/Thresh Q hitbox rant.