馃馃棅 CMake: Several fixes and downgrade to 3.16.3
- Set target_include_directories for integration in projects using CMake prior to version 3.23
- Fix install path to work with CMakes config mode search procedure
- Adjust config script to forward dependencies
- Add FindAntlr4Runtime and FindOpenScenarioAPI to installed files and fixed *_FOUND variable for correct usage within find_dependency
- Renamed namespace from OSE to OpenScenarioEngine (use OpenScenarioEngine::OpenScenarioEngine as lib name)
- Set CMAKE_INSTALL_RPATH to $ORIGIN
- Copied .cmake-format file from MantleAPI and applied new format
Closes https://gitlab.eclipse.org/eclipse/simopenpass/openscenario1_engine/-/issues/15