BlendLuxCore

Fresnel texture: "custom n,k" now accepts values > 1
Change installation mechanism to use bpy.utils.extension_path_user() INCOMPLETE
Include "OptiX" in addon settings label to avoid user questions about compatibility
Added a workaround for a Blender bug that throws an error when Blender is closed
Added a linux development shell script (optional utility for developers)
Remove löeftover code from the Addons system that is no longer used with the Extensions system.

LuxCore

Reduction of Boost footprint, replaced with standard equivalents available in C++20.
For the need of previous point: replacement of apple-clang by clang 20 on MacOS platforms
New target 'wheel-test' that builds a testing wheel in local build (make wheel-test)
Requirement checking in make deps
luxrays: rename GetConfigDir as GetCacheDir and use XDG_CACHE_HOME according to specifications (@illwieckz)
Subdivision: add an "adaptive" setting to select between adaptive refinement and uniform refinement

Dependencies updated to latest versions
Removed a workaround introduced in previous version (we used to build a fake wheel to get containerization)
OpenMP - MacOS: Use of homebrew OpenMP (up-to-date, compatible with clang 20) rather than Conan llvm-openmp (version 17...). As a consequence, for MacOS Intel, a version >= 13.0 is required.
Opensubdiv: tbb activation. As a consequence, for MacOS Arm, a version >= 14.2 is required.
OpenImageIO: deactivation of several image formats that seem unrelated to or unsupported by LuxCore: freetype, hdf5, ffmpeg, libheif, ptex, opencv, webp. This removal spares both compilation time and build result size. Those formats are reactivable, in case they were missing.
OpenImageIO: To the contrary, activation of tbb option.