0.61.4 - Quantum Leap

This is a bugfix release. Changes:

• Exhaust gas simulation is no longer affected by adrenaline boost induced bullet-time.
• Fixed "exit to main menu" option on demo end screen.
• Game loading now faster by 40%.
• Adjusted density of the rings.
• Fine-tuned the tutorial display options to be more readable.
• Lights on Enceladus no-linger blind the camera for dive summary screen.
• Fixes audio on boot splash.