BlockTuner-classic v1.5.1-classic

Removed unnecessary features:

1. Ctrl key required to open the GUI; does not open if you place "note" tagged noteblock
2. pitch un-clamping; use RS-256/infinote instead

Make hard-coded code customisable:

1. The inventory key required to close the GUI

simply updated to recent version; gradle, fabric mod loader, mappings (to mojang), and minecraft version