Allows us to get rid of build.rs, which was only used to
compile resources. static_resource.rs is now created by
meson, and the meson path is used for include_bytes!.
Closes https://gitlab.gnome.org/World/podcasts/issues/55
This adds a configuration option in meson, if set it changes the
application ID allowing for stable and development version to be
run at the same time.
