Removal of meson from Rust templates.
We should use Rust's build system and package manager instead of Meson. As it is, Meson and Cargo are both mixed up. This makes adoption outside of gnome-builder more difficult than necessary (e.g. CLion currently does not natively support Meson projects). A Potential alternative would be to relies on Cargo build scripts.
use adw::gio::compile_resources;
// Example custom build script.
fn main() {
// Tell Cargo to compile the project gresource.
println!("cargo:compile-gresource=src/demo.gressource");
// Use the `adw` crate to build a gresource file.
compile_resources("src", "src/demo.gresource.xml", "demo.gresource");
}