Bundle all the required files next to the generated binaries

• Move the assets directory next to the generated

  Having the binaries and the assets next to each other allows us to have a single directory that needs to be uploaded to a devkit.

• Include the Windows debug libraries

  When creating a debug build, the executables depend on several Windows debug DLLs. But they are not expected to be available if the build is transferred to a Linux based system that uses Steam Play.

• Automatically download the asset pack