remove miniz.h and use zip.c instead.

[hoche]

Note

Replace the bundled miniz with a zlib-based ZIP implementation and remove the embedded header.

• ZIP I/O (zlib):
  • Rewrites src/zip.c to use zlib (zlib.h) instead of miniz.h.
  • Implements ZIP open/close, entry open/close, write, CRC32, and central directory/local header read/write; adds LE read/write helpers and DOS time handling.
  • Stubs/not fully implements certain extract/read helpers (e.g., zip_extract, zip_entry_fread).
• Dependencies/Removal:
  • Removes embedded src/miniz.h.
• Misc:
  • Minor formatting/whitespace tweaks in src/lrp.cpp (fprintf formatting) and tests/udt_test.cpp (include order/spacing).

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