Embed OsmAnd offline maps in PySide6 apps

PySide6-OsmAnd-SDK brings OsmAnd’s native offline map engine to modern Qt6 and PySide6 apps. It lets developers embed a native map widget, render localobf map files without online tiles, and test with a runnable preview app. The project includes Python integration, C++/OpenGL rendering paths, demo map data, and build scripts for Windows, Linux, and macOS.