[Version] Bump version to v0.6.0

[HaiyiMei]

• Fix the reloading problem of RPCFactory bf9db43 75cc595 ccd3fd5
• Fix camera parameter exported by CameraParamter 312cc34
• Optimize MeshOpertator in UE 254d7ec
• Move anim from samples.anim to xrfeitoria.utils.anim 8c0b7f9
• Update CLI 9ebc0e3
  • move cmd to cmd/blender
  • add xf-install-plugin
• Add Material 923a197
• Add reload_rpc_code in xf.init_blender(reload_rpc_code=...) or xf.init_unreal(reload_rpc_code=...) 4d00478
• Polish setup_logger 5336af4
• Add more levels in logger, 'RPC' < 'TRACE' < 'DEBUG' < 'INFO' 4d00478
  • 'RPC' (custom level): logging RPC messages which are sent by RPC protocols.
  • 'TRACE': logging engine output like console output of blender.
  • 'DEBUG': logging debug messages.
  • 'INFO': logging info messages.
• Add dump_humandata for SMPLMotion and SMPLXMotion 6de395e
• Refactor Sequence abadc7e
  • add sequence and deprecated Sequence, merge Sequence.open() and Sequence.new() into one function
• Optimize version control 5defe13 d762cec c737175
• Add instructions on building/publishing your own plugins c737175 eb1c5c7
• Add support for exporting audio for Unreal 919aa41
• Optimize Docs