0.1 - Isolate Sunlight from 3DUSE

• Create pipeline and roadmap.
• Create Installation guide.
• Create documentation to create 3DUSE bounding box files.
• Extract minimal code from 3DUSE plugin in another reposity.
• Remove Qt library and boost dependency.
• Replace home made log system by an external library (spdlog).
• Produce a new CMake with only Sunlight dependancies (and not 3DUSE).
• Add error message on missing bounding box files.
• Add warning message on missing sun position datas.
• Replace raw pointers by std::smart_pointers to avoid memory leak.
• Change C++ version to C++ 20, because we are using advanced features (optional, filesystem...).

Full Changelog: https://github.com/VCityTeam/Sunlight/commits/0.1