Martello 1.2.1 for macOS

Manual installation:

1. Copy VST3/Martello.vst3 to:
   /Library/Audio/Plug-Ins/VST3/

2. Copy AU/Martello.component to:
   /Library/Audio/Plug-Ins/Components/

Administrator authorization may be required. Restart your audio host after
installation. Both plug-ins are signed universal macOS binaries containing
x86_64 and arm64 code.
