Polyscope 2.6

[dcoeurjo]

PR Description

Also removing the local polyscope and use the version shipped with DGtal when DGTAL_WITH_POLYSCOPE_VIEWER is set. The doc should probably be updated.

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).

[dcoeurjo]

At this point, it works for polyscope2.5 in DGTal (main) but not the 2.6 PR

[dcoeurjo]

Hi @kerautret I am merging this one to unlock DGtal GitHub actions. We will fix the doc later

[kerautret]

Thanks @dcoeurjo that noticed