MYST3: Implement movie volume control
MYST3: Add the 4.0 surround volume table from the xbox version

This is unused for now, and included for reference when
adding surround support
MYST3: Implement sound fading
MYST3: Implement more sound related opcode
GRIM: Fix display of movies [OpenGLS]
GRAPHICS: Add scale option (defaults to 1)