v4.5.0

New in this version:

• Supports flow into header/footer (fixes #63)
• Enhances volume-transition
• Fixes marker-reference issue (fixes #39, closes #94)
• Improves translate option in LayoutEngineTask
• Limits "unsupported locale" warning count in ExpresssionImpl
• Uses a default marker processor if none is found
• Removes language guard in LayoutEngineFactory