Add include_standard_packages to Definitions.

examples/definitions/.rhai/all_in_one_without_standard.d.rhai

@@ -0,0 +1,10 @@
+module static;
+
+op minus(int, int) -> int;
+
+module general_kenobi {
+/// Returns a string where "hello there" is repeated `n` times.
+fn hello_there(n: int) -> String;
+}
+
+let hello_there;