Change log:
- Fix typos in USAGE.md
- Fix building with Gtk 4.10
- Update README.md and USAGE.md with current driver information
- Add link to fundraiser for adding Scarlett Gen 4 support
- Fix input counting for Clarett+ series
- Update README and USAGE files with new Clarett info
- Split USAGE.md into INSTALL.md and USAGE.md
- Add Clarett Plus 2Pre and 4Pre demo files
- Update Clarett USB and Clarett+ status
- Apply correction curve to the dials
- Update README with Gen 4 and Vocaster info