Refactor: split predicates.cxx and tetgen.cxx into modular files
- Extract predicates declarations into predicates.h - Extract I/O functions from tetgen.cxx into io.cxx - Remove duplicate helper functions from tetgen.cxx
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- Extract predicates declarations into predicates.h - Extract I/O functions from tetgen.cxx into io.cxx - Remove duplicate helper functions from tetgen.cxx