EMI Demo: Fix a segfault when trying to read from the registry and allow the user to skip the intro movie

When you press F1 during the intro movie, then ESC to return, the EMI-Demo segfaults. This patch fixes that segfault by adding support for the registry. These functions appear to be leftovers from Grim that remain in the Demo.

The second change allows the user to skip the intro movie by pressing ESC. It works on the original engine, but not here. I haven't figured out if there's an error in the scripts, but I'm not seeing a way to skip it. This hack lets us skip the movie anyway.