refactor: modularize codebase and improve type safety

src/lib.rs

@@ -0,0 +1,10 @@
+pub mod cli;
+pub mod log;
+pub mod render;
+pub mod spec;
+pub mod tmpl;
+
+pub use cli::Args;
+pub use log::LogLevel;
+pub use render::DeviceConfigBundle;
+pub use spec::Specification;