A bunch of improvements and fixes.
- Fix heap corruption in DICT Filter.
- Make default Dedup block size as 8KB.
- Revamp executable file handling: Part#1.
- Developed new E8E9 filter that works better than Dispack on raw data blocks.
- Remove block-based Dispack encoding. File-specific Dispack filter to be added.
- Improve file header based executable file detection.
- Introduce new sorting algorithm for filenames without extension.