DIRECTOR: Stub/Implement the XObjects used in Gahan Wilson's Haunted House.

[somaen]

This adds a minimal implementation of the various XObjects used in Gahan Wilson's Haunted House, of note is that this does some modifications to the common aiff-decoder to be able to implement the "Duration" query in the aiff-xobject.

The XObjects stubbed/implemented are:

• GPID - Product Identification Number
• JourneyWareXINI - Windows Registry queries
• MovUtils - MovieUtilities
• AIFF - Mainly support for querying the duration of AIFF-files.

This does make the intro to Gahan Wilson work a bit better, but sadly the game still doesn't progress beyond the Foyer yet.

Comments are very welcome.

[sev-]

Please add to the Xtras header comments

 * USED IN:
     <game name>

[somaen]

Done, I was a bit unsure where to best do so, as the current comments are a mix between cpp and h, so I picked the one that was most common. While at it I also fixed a slight oddity in the copyright header (missing spaces in front of the asterisks in most lines)

[somaen]

Oh, just realized that the branch wasn't up-to-date, the latest push should have some further cleanup as well.

[sev-]

Excellent, thank you!