Make common a proper library: add [lib], src/lib.rs, clean up build.rs

common/Cargo.toml

@@ -10,3 +10,7 @@ prost   = "0.12"
 
 [build-dependencies]
 tonic-build = "0.11"
+
+[lib]
+name = "navka_common"
+path = "src/lib.rs"

common/build.rs

@@ -1,8 +1,3 @@
 fn main() {
-    tonic_build::configure()
-        .build_client(true)
-        .build_server(true)
-        .out_dir("src/")
-        .compile(&["proto/navka.proto"], &["proto"])
-        .unwrap();
+    tonic_build::compile_protos("proto/navka.proto").unwrap();
 }

common/src/lib.rs

@@ -0,0 +1,4 @@
+// Re-export the code generated by build.rs (navka.rs, relay.rs, etc.)
+pub mod navka {
+    include!(concat!(env!("OUT_DIR"), "/navka.rs"));
+}