Version 1.5.9

Some changes and additions since v1.5:

• Fixed powerups showing on the main menu when the player dies with a powerup.
• Try to keep texture seams from showing when fullscreen.
• Added quit confirmation screen.
• "Controller" menu renamed "Button Map".
• Add Controller deadzone menu and slider.
• Moved sound and music sliders to new menu for Windows.
• Added deadzone setting.
• Increased turn tics from 2 to 3.
• Fixed double-pausing.
• Fixed infinite loop while generating level 39 causing game to freeze.
• Added bonus disappear sound.

Linux updates will follow.