Add support for:
- basename() function for extracting filenames from paths
- cstring() function for reading null-terminated strings
- ascii() function for reading fixed-length ASCII strings
- Enhanced type registry with additional primitive types
- Improved parser with better error handling
These additions enable more flexible XScript definitions for
parsing binary file formats.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
