Refactor changes: make CMake variables available to consumer projects (e.g. ,...

Refactor changes: make CMake variables available to consumer projects (e.g. , , , Loop over targets instead of manual specification (-> had to move two CLIs to the correct folder), Delete 'psrdada_cpp/src/dada_input_stream.cpp' not necessary -> implementation in header, Added CMake flag 'FORCE_DOWNLOAD' to force remote fetching

cmake/Config.cmake.in

-@PACKAGE_INIT@
-include("${CMAKE_CURRENT_LIST_DIR}/@PROJECT_NAME@Targets.cmake")
-
-check_required_components("@PROJECT_NAME@")
\ No newline at end of file