v1.6.3

• Stop purging summary.subjects when doing phenotype checks
• Remove unused reference to node 'crypto' module
• Browser build fixes for esbuild
• Use pako to inflate remote file gzip buffers
• Documentation updated to reflect npm 7 being needed for development
• Fix HED placeholder tests
• Update bep009 according to newest PET-BIDS specification
• Add npmignore to ignore test data
• Allow events.json and scans.json to be defined at the top level + tests
• Upgrade aws-sdk to 3.9.0
• Bump elliptic from 6.5.3 to 6.5.4