conda-forge migration

It might be in our interest to base our builds based on conda-forge. Here is what comes to my mind to enable the migration:

• Cache conda-forge recent (and needed) packages from linux-64 and osx-64 and osx-arm64 builds
• Vincent: update libblitz-feedstock to match ours
• Tiago: remove vlfeat dependency from bob.ip.base Fix and merge https://github.com/conda-forge/vlfeat-feedstock/pull/9
• Laurent: Submit zc.buildout to conda-forge
• Laurent: Submit zc.recipe.egg to conda-forge
• Amir: We need to use conda-forge docker image(s), their compilers, and mac requirements
• Remove deps from bob/bob.devtools>
• Start building bob/bob.devtools> based on conda-forge
• Update pin versions in bob.devtools
• Archive bob/conda>
• Amir: We need to delist packages in our channel that are already in conda-forge using metadata patches
• Delete all the beta packages
• Start building bob packages based on conda-forge
• Use https://github.com/conda-forge/miniforge/ instead of miniconda
• We might need to support yum-requirements.txt to support pyopengl which needs mesa-libGL-devel package installed. See: https://gitlab.idiap.ch/bob/bob.devtools/-/blob/5cd514f64181dd0ee834aaf61ebb189c0257e9f8/.gitlab-ci.yml#L71 https://gitlab.idiap.ch/bob/bob.ip.view uses pyopengl