Resolve "Change JastAdd version to updated, packaged one"

- use packaged jastadd2 (dresden version), relast, preprocessor
- remove relast-preprocessor
- update preprocessor.testing to work with packaged relast
- add base as additional dependency for tests because of Errors test (as there, the compiler is invoked directly)
- update log4j
- use standardized build.gradle structure
- build non-master version with appended CI pipeline IID