* log: move show functions to new class
Enhance ZIF_ABAPGIT_LOG
- add IS_ITEM structure (object) to message adding functions
- add method "add_exception"
- add method "add_info"
- relocate methods "show", "to_html" and "write" to new class ZCL_ABAPGIT_LOG_VIEWER
Introduction of new log viewer class ZCL_ABAPGIT_LOG_VIEWER
Replacement of relocated methods where used
-> This is the next step providing a log for serialzation/de-serialization (see #2534)
* fix abaplint issues
fix abaplint issues
* fix abaplint issues (2)
fix abaplint issues
