v0.17.3: Fix eager engine access during init

✨ New features and improvements

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🔴 Bug fixes

• Engine classes were accessed eagerly during engine intialization, even without the corresponding library installed. This is fixed in this patch - engine classes are only accessed during init if the corresponding library is installed. (#181)

⚠️ Backwards incompatibilities

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📖 Documentation and examples

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👥 Contributors

@rmitsch

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Full Changelog: v0.17.2...v0.17.3