Graphical updates

Added more options(scanlines, bloom, screenshake) to the main menu options and improved clarity of the foreground.

• Added new reactive background grid (can be toggled off)
• Updated background colors to make it easier to see the foreground
• Added visual indicator around the player to show how much overload meter you have
• Added background effects and new visuals to the boss
• Reduced contrast of scanlines (can now be toggled off) for clarity