0.1.a - bugfix update for demo build

Bugs fixed:

• opening map screen should not crash the game any more. Additionally, map screen now shows the correct sprite at all times.
• screen glitches due to scan shader ram manipulation suppressed.
• small tweaks in camera code

Features added:

• Added text instructions to main menu
• Sound effects added and/or tweaked
• Scanned milestones now have a pulsating effect....?
• [ redacted ]

Known bugs left:

• In some machines, some rooms are laggy.