- remove the old LGPL license headers from all files in Spack
- add SPDX headers to all files
- core and most packages are (Apache-2.0 OR MIT)
- a very small number of remaining packages are LGPL-2.1-only
* Created the initial version of the 'OpenSceneGraph' package.
* Added 'zlib' as a dependency and linked it during the build step.
* Fixed a few minor PEP8 style violations in the 'OpenSceneGraph' package.
* Added cmake as a build dependency and improved the build procedure.
* Made a few important argument updates to improve package compatibility.
* Fixed up a few remaining style issues in the 'openscenegraph' package.
* Added a description for the 'openscenegraph' package.
* Fixed a bug that was causing some 'openscenegraph@3.2.3%gcc' installs to fail.
* Fixed a number of small issues with the 'openscenegraph' package.
* Removed a number of superfluous flags from the 'openscenegraph' install.
