Ideas/new features for `lox-cli info` tool

[LukasKalbertodt]

• Print properties of the mesh that require analysis:
  • Is closed?
  • How many connected parts?
  • All faces triangular? Quad faces?
  • Unconnected vertices
  • ...
• Output infos in different formats (including JSON)
• Make it possible to pass multiple files to the command
• Maybe specific questions like --query is_solid where it just prints true or false?