feat: add Python 3 Hatenatools port

* Port PPM and TMB parsing to Python 3
* Port UGO and UGOXML handling
* Port NTFT image encoding and decoding
* Update binary data handling for Python 3 bytes
* Replace Python 2-specific syntax and APIs
* Add Python 3.13-compatible ADPCM decoding
* Preserve existing Flipnote format behavior and CLI utilities

Hatenatools/__init__.py

@@ -0,0 +1,6 @@
+# Convenience imports for Hatenatools
+from .PPM import PPM, TMB
+from .UGO import UGO
+from .NTFT import NTFT
+
+__all__ = ["PPM", "TMB", "UGO", "NTFT"]