v1.5.0

• Add support for M1 Macs
• Blob sizes are now much smaller
• Opted-in to sound null-safety
• Rewrite most of the existing codes to be more concise and clearer, and also more performant by reducing io reads as much as possible and by caching a lot
• Use meaningful error codes with better error messages
• Rename subcommands to references
• Remove "execution type" which is useless and confusing
• Publishing is now done via GitHub Actions