v0.3.0

• Renamed to cargo-acl
• UI now only activates when necessary.
• check and ui subcommands removed - now just run with no subcommand and turn the UI off with
  --no-ui or -n.
• cargo subcommand removed. Instead of cackle cargo test, now you run cargo acl test.
• Now available as a github action.
• Allow APIs based on what kind of binary is being built (test, build script or other)
• sandbox.make_writable can be used to create directories that need to be writable
• Automatic edits now use dotted notation within pkg.x rather than defining a separate
  pkg.x.build etc.
• Backtraces can now display sources from the rust standard library.
• Various other bug fixes