refactoring: added libbdc/bdc_io, bdc_strings, bdc_hashtable and bdc_logging

libbdc/CMakeLists.txt

libbdc/bdc_hashtable/CMakeLists.txt

libbdc/bdc_hashtable/bdc_hashtable.c

libbdc/bdc_hashtable/bdc_hashtable.h

libbdc/bdc_hashtable/tests/test_bdc_hashtable.c

libbdc/bdc_io/CMakeLists.txt

libbdc/bdc_io/bdc_io.c

libbdc/bdc_io/bdc_io.h

libbdc/bdc_io/bdc_paths.c

libbdc/bdc_logging/CMakeLists.txt

libbdc/bdc_logging/README.md

libbdc/bdc_logging/logging.c

libbdc/bdc_logging/logging.h

libbdc/bdc_strings/CMakeLists.txt

libbdc/bdc_strings/README.md

libbdc/bdc_strings/bdc_strings.c

libbdc/bdc_strings/bdc_strings.h

libbdc/bdc_strings/pretty_print.c

libbdc/bdc_strings/string_converters.c

libbdc/bdc_strings/string_helpers.c