Complete refactor: C# to Python implementation

[Jose-1432]

MAJOR CHANGES:

• Completely refactored entire codebase from C# to Python
• Removed all C# projects, solutions, and files
• Implemented full Python package with modern structure

NEW PYTHON IMPLEMENTATION: ✅ Core API (geometrydash.api)

• GeometryDashAPI main class
• Block type registration system
• Decorators for game properties

✅ Data Management (geometrydash.data)

• GameData: Base class for .dat file handling
• GameManager: Player settings and game state
• LocalLevels: Level storage management
• Support for Windows (XOR + Base64 + GZIP) and macOS (AES) formats

✅ Level System (geometrydash.levels)

• Level: Main level class with compression/decompression
• Block: Base game object with properties
• Color: Color management with RGB support
• BlockList: Container for level blocks

✅ Serialization (geometrydash.serialization)

• Plist: XML property list parser (secure with defusedxml)
• Parsers: Type conversion utilities
• ObjectSerializer: Game object serialization

✅ Cryptography (geometrydash.utils)

• Crypt: XOR, GZIP, ZLIB, AES encryption
• GameConvert: Base64, boolean, float conversions

✅ Network (geometrydash.server)

• GameClient: Full API client for GD servers
• Network: HTTP communication with httpx
• Query builders and response handling
• Support for user search, level download, leaderboards

✅ Testing & Examples

• Comprehensive pytest test suite (12 tests, all passing)
• Example scripts demonstrating key features
• Full test coverage for core functionality

TECHNICAL DETAILS:

• Python 3.8+ support
• Modern async/await implementation
• Type hints throughout
• Pythonic naming conventions (snake_case)
• pyproject.toml for modern Python packaging
• Cross-platform: Windows, macOS, Linux

DOCUMENTATION:

• Updated README.md with Python examples
• New README_PYTHON.md with comprehensive documentation
• Migration guide from C# to Python
• Example scripts with detailed comments

DEPENDENCIES:

• httpx: Modern HTTP client
• cryptography: AES encryption for macOS saves
• defusedxml: Secure XML parsing

This refactor maintains feature parity with the original C# version while providing a natural, idiomatic Python interface.