v3.0-pre

• Add the feature to automatically install librosa via pip into blender's built-in python when installing add-ons.
  • Running a shell from an addon may result in unexpected exceptions or errors. Also, the installed libraries increase the possibility of conflicts. There are solutions to these problems, but they are very hard for me (mainly licensing). So, just be on your own to use it!
• Added operator for automatic BPM analysis and add marker.
  • If librosa has been installed to blender, this operator may be used successfully.
  • To use this operator, a button exists in tools of the sequence editor. With an audio sequence selected, press the button.