cleaning up detection.cpp by removing all references to the disk.1 file and using AD_ENTRY2s
for Groovie v2 games, make sure to search for a file in the GROOVIE folder and also a file in the MEDIA folder, in order to ensure the user is adding the root game directory and not a subfolder, this also ensures that Mass Add Games works correctly without broken duplicates
also improved the error message in resource.cpp for when a file from a different disk is not found
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.
