Vol file visualization (hex mesh, point cloud, isosurface) using polyscope

[dcoeurjo]

PR Description

• Adding polysocpe to DGTalTools
• New volscope tool

Checklist

• Doxygen documentation of the code completed (classes, methods, types, members...).
• Main tool doxygen documentation (following existing documentation of DGtalTools documentation.
• Check if it follows the tools structure described in CONTRIBUTING.md
• New entry in the ChangeLog.md added.
• Update the readme with potentially a screenshot of the tools if it applies.
• No warning raised in Debug cmake mode (otherwise, Github Actions C.I. will fail).
• All continuous integration tests pass (Github Actions).

[kerautret]

Nice I I look it ! Btw I also made another tools on contrib here if you have time to have a look

[kerautret]

Nice tools, just some suggests and adding a new entry in the readme ? (with screen shot is could be nice)

[kerautret]

ping @dcoeurjo, all almost fine from suggested commits, and it could merits also a new entry in the readme eventually with the screenshot ;)

[kerautret]

Thanks merged