ZVISION: Rename RlfAnimation -> RLFDecoder
ZVISION: Move the RLF decoder
ZVISION: Simplify the working window code
ZVISION: Prefix class member variables with an underscore

This makes the code adhere to our code formatting conventions
ZVISION: Make the RLF decoder a subclass of the common video decoder

This way, the redundant MetaAnimation class can now be removed
ZVISION: Move the mouse cursor handling code into the graphics code
ZVISION: Move the MIDI code together with the rest of the sound code
ZVISION: Move all the file-related classes together
ZVISION: Move all the remaining utility classes into the core
ZVISION: Move trimCommentsAndWhiteSpace() into the script manager

This allows us to remove the last remnants of utility.*