Version 3/4

Version 3 (Windows/Linux) and Version 4(Mac) update. Created new title and menu screens to replace generic gray backgrounds used previously. Main menu screen is now animated with a game level, and a camera pan to the scoreboard. Removed obvious debugging tools and text from gameplay area. Implemented a scoreboard, which will place the player's score on the appropriate spot on the leaderboard if the score exceeds one of the top ten scores. Does not yet retain scores in memory from session to session, but the basic function of the scoreboard works as intended.  Also made miscellaneous tweaks for gameplay and software stability.