Compatibility updates for PyTorch 1.11.0 and AutoAnchor supports

This release is mainly compatibility updates for PyTorch 1.11.0 (#359) and to support loading the checkpoints trained with AutoAnchor mechanism in YOLOv5 (#285, #352).

Besides, we

• Move bias initializations from private methods to constructors (#351)
• Upgrade PyTorch minimal version to 1.8.0 (#359)
• Added support for Python 3.10 (only works with PyTorch 1.11) (#359)
• Remove lightning strong dependencies (#355, #358)
• Update tutorials with Visualizer (#354)
• Small grammar and spelling fixes (#357)

We're grateful for our community, which helps us improving yolort by submitting issues and PRs, and providing feedback and suggestions. The following persons have contributed patches for this release:

@mattpopovich @zhiqwang

Full Changelog: v0.6.1...v0.6.2