Android support

Currently the code is splint in 2 branches:

• master contains the Windows code of the plugin. It targets libvlc 4 and builds with llvm-mingw.
• android contains the Android code of the plugin. It targets a patched libvlc 3 build and builds with gcc on docker.

Need a working libvlc 4 android build to do this, and rework the makefile and bash build script.