Follow up on PR #166

[jfpanisset]

List of issues to address once PR #166 is merged:

• Duplicate entries for mypy and pytest in Pipfile
• How do the versions of Python / Conan in Pipfile interact with the year-specific versions
• and how does the Conan version set in packages/conan/settings/version.txt interact with those?
• better approach to "vendoring" Conan recipes
• update to Conan 2
• clean up packages from CentOS 7 which no longer make sense (libdb4, openjpeg 1)
• get rid of PATH to git-218
• follow up on how to set default C++ ABI (CY2023 requires C++ 11)
• in build-qt.sh don't need special includes of openssl11 -I or -L
• revisit hack for Conan Python sysconfigdata relocation, find solution which works with Conan 2
• build PySide with newer Cmake
• OpenVDB wants to be built with jemalloc
• build_alembic.sh first downloads and builds HDF5 but it doesn't seem to configure it in with -DUSE_HDF5=ON'
• build GUI for MaterialX
• Optix build and runtime components
• why are base Conan packages paying the full price of installing yum packages instead of using the pre-built common image
• better workaround for qtsan_impl.h in QT Conan build
• fix hacks in packages/conan/recipes/clang/conanfile.py with hard coded Python versions
• revert to unpaid runner for release builds?
• cppunit unit test failing in Conan build?
• fix clang conan builds (issue with Python Conan package options)