- Implemented LZSS compression in lha/lzss.c and lha/lzss.h.
- Added PMarc decompression functionality in lha/pmarc1.c and lha/pmarc1.h.
- Updated library.h to include declarations for new decompression functions.
- Enhanced tests to cover LHA decompression for LH1, LH6, and PMarc formats.
- Added test helpers for loading LHA payloads and validating decompression results.
- Included sample data files for testing LHA and PMarc decompression.