timely-v0.15.0

Other

• Prefer byteorder in place of bincode (#607)
• Use help from columnar 0.1.1 (#606)
• Reorganize Container traits (#605)
• Robustify potential Bytes alignment
• Correct bincode call to use and update reader
• Demonstrate columnar stuff (#586)
• Allow containers to specify their own serialization (#604)
• Remove Container: Clone + 'static (#540)
• Apply various Clippy recommendations (#603)
• Several improvements around Bytesable and Message. (#601)