Improve the path completion and tilde support in path

[daxian-dbw]

PR Summary

• Improve the path completion and tilde support in path
  • Make path completion better handle quotes and spaces in the path
  • Make path completion able to work for paths starting with ~
  • Add support for tilde expansion in the path for /code save <file-path>
• Update the minimal PowerShell version required for loading the AIShell module
• Comment out the /render command, which is for debugging purposes.