Update 1.6 Minor Usability Tweaks

[img]http://i.imgur.com/3lqDaRT.gif[/img] - Added window border so players can click and drag the window. - Added pause menu item to view leaderboards and high scores during the game. - Modified text in the optional tutorial to have a black background and require a button press to continue. - Modified the optional tutorial to flow better, added a box around the text and slowed the background. - Modified options to be a more defined miniature vessel helper ship. - Modified leaderboard so your own scores are in yellow. - Modified explosion sounds to have more crunch to them. - Modified the screenshot system to keep trying for a screenshot if one screenshot fails to capture.