increase code coverage, general code refactoring

Added

• add cross compile file for sparc
• add tests for the compression entity
• add test for cmp_rdcu_cfg.c
• add sparc inttypes.h definitions ###Changed
• refactor function and constants names
• refactor configure check functions
• move the rdcu setup functions to cmp_rdcu_cfg.c
• update Documentation
• update Doxygen setup

Fixed

• remove memory leaks from tests