Migrate download hosting to Github

- Migrate Umineko to Github
- Migrate Higurashi ch2-4 to github
- Migrate Higurashi ch5-10 to github
- update tag for mod common files
- Migrate higu and umi mod options
- Update higurashi voice-only and umineko legacy links
- Fix bad links and update cachedDownloadSizes
- Add .exe archives for Umineko to ensure "Quick Repair" function works.
 - Note: these archives are unnecessary for manual installation
- Fix umi movie and console extra movie file

Author: drojf