General changes:
- Fix black UI on init under some hosts
- Fix LV2 scale factor when not provided by host or in macOS
- Fix VST2 crash when removing 1 of many instances
- Initial, experimental CLAP plugin format support
- Make standalone only rely on JACK, skipping native audio fallback
- Use a single nanovg context (improves GUI CPU/GPU usage)
CI/Build related changes:
- Add linux-riscv64 CI builds
- Remove JACK Standalone on Windows zip builds