Radium

Radium now runs on macOS 11.
VST3 plugins are finally supported on Linux.

Changes 6.9.86 -> 6.9.88:

• Editor/Instrument: Enable sample-seek by default.
• Macos: Runs under Macos 11.
• Windows: Antivirus programs should never scan
  LADSPA plugins during startup anymore.
• VST3: Don't allocate memory in realtime code for
  VST3 plugins when setting parameter values.
• Editor: Fix "Rec" not being removed immediately
  after stopping to record MIDI input.
• Linux: Fix JUCE thread issues which might have
  caused glitches in sound when using VST plugins.
• JUCE: Upgrade to V6.0.8. Most important change is
  probably support for VST3 plugins on Linux.