Initial MetaCrate rewrite shell

programs/src/bin/test_client.rs

@@ -0,0 +1,5 @@
+fn main() -> std::process::ExitCode {
+    let command_count = libremetaverse_programs::commands::TEST_CLIENT_COMMANDS.len();
+    eprintln!("TestClient command inventory contains {command_count} translated targets");
+    libremetaverse_programs::pending_program("TestClient")
+}