renamed solver to KiT-RT and adjusted all scripts to the new name; reworked CMakeLists by e.g. adding CTest to allow unit tests by "make test" (unit test binary will be placed in the build dir now); moved all non-category source files to toolboxes; fixed some compiler warnings


Former-commit-id: 9f3e992f

Fixed lib path to include /usr/local/lib for .gitlab-ci.yml; should be included in the docker image in the future