LinkedList of Scenes created in main and recreated in SceneManager when transitioning from last Scoreboard scene to Title scene
Individual sub-classes of Scene include: Title, Round, Scoreboard, EndGame, and Tutorial. We also might want to add a Pause/Esc Scene (or just save state, wipe canvas, redraw Pause/Esc Scene data, and then restore to Round's state upon click/key press)
The 'Scene interface' that the Scene Manager employs to do its logic includes: reset(), update(), draw(), startScene(), endScene(), and isSceneDone(). isSceneDone() was the method name chosen over isDone() b/c the Animation class already had an isDone() method and I didn't want any confusion.
Migrated all that ugly logic involving bool flags in PlayGame to SceneManager
Lastly, for the implementation of EndGame, almost all of the data necessary to flesh out that Scene is there (I'll work on that today in class); see console output after Round 3's Scoreboard for indvl round scores and total game score.