v0.10.0

• Upgrade build dependencies
• BREAKING: Remove the --read-buffer setting as it's no longer used
• PERF: Use tokio::fs::copy for copying file data
  -- By using tokio::fs::copy we are able to use the copy_file_range system call in Linux which dramatically speeds up the copies (at least 5-20x in our tests).
  -- Note the tokio::io::copy(_buf) functions don't seem to be able to use this syscall reliably in our testing
• PERF: Fix filegen to use much less memory
• Fail with a better error message on non-file fs objects (e.g. socket)