Start using clang tokens for the Rust code generation

src/main/java/ghidrust/decompiler/codegen/rust/RustVisitor.java

@@ -0,0 +1,25 @@
+package ghidrust.decompiler.codegen.rust;
+
+import ghidra.app.decompiler.ClangNode;
+import ghidra.app.decompiler.ClangBreak;
+
+public class RustVisitor {
+    public String visit(ClangNode cn) {
+        /* This part is very ugly, but we don't have open classes
+         * do we can't define new virtual methods, hence the only
+         * way to dispatch is to check the node's type dynamically
+         */
+
+         if (cn instanceof ClangBreak) {
+            return "break;";
+         } else {
+            /* Unimplemented */
+            StringBuilder sb = new StringBuilder("unimplemented {");
+            for (int i = 0; i < cn.numChildren(); i++) {
+                sb.append(visit(cn.Child(i)));
+            }
+            sb.append(" }");
+            return sb.toString();
+         }
+    }
+}