Began implementing dynamic tile collision.
Added Acre::getTiles(), Player::colliding(), and Player::manageTileCollision(). In the Thaed object, the contents of the current acre's tile vector is passed to Player via Player::manageTileCollision(). There, a test is performed to see if the player is colliding with a tree on the secondary island. The system is not quite finished yet, but is heading in the right direction.