Draft: Introducing new android backend
I'm working on an Android backend implementation for GDK/GTK, with the goal of eventually merging it upstream. The aim of this PR is to establish a functional initial implementation that is sufficiently stable to be merged.
The goal of this PR is to have a working initial implementation that works well enough to be merged. After that my plan is to initially write a "bundler" application that can be pointed to a codebase and configuration to generate the android application directory structure and files and using that then builds a apk. Future efforts after that should then go into implementing still missing features such as OpenGL/Vulkan rendering or integration with GStreamer for the media backend.
The implementation currently works on Android 14 (SDK 34) but is missing crucial features and contains several bugs. The plan is to target Android 13 (SDK 33) in the future.
