HAVAL v1.3

• Switch from separate from_* methods to an overloaded hash method.
• Add new end_to method to store result in a user-provided buffer.
• Expose library version via havalver.h file.
• Add an (optional) Qt convenience wrapper with Qt 5 and Qt 6 support.
• Support specifying components when using find_package with CMake; currently 3 components are provided: "core" (STL-based library), "qt" (Qt-based wrapper), and "app" (CLI tool).