Complete refactor: C# to Python implementation

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.

Author: claude