This commit fixes problems with commit acad766 which disabled the open house
savegame in The 7th Guest and The 11th Hour. These games use slot 0 to write a
special savegame when the game has been completed. This conflicts with ScummVM
autosave functionality, which also uses slot 0 by default. To fix this, the
autosave slot has been moved to slot 24, the last available save slot. The
workaround from commit acad766 for saving in slot 0 has been removed.
The intro music is now fixed by checking for a load of slot 0 and not stopping
the music in this case.
For each engine:
- Make a new folder detection
- Move detection-related files inside the folder
- Add a new module "enginename/detection"
- Add DETECT_OBJS here
- Adjust the normal engine module to remove detect_objs
- Adjust every file for the new changes.