Add an option to "uglify" imports

This commit adds an option to "uglify" the wasm module's imports/exports so
those which are controlled by bindgen are renamed to a shorter (probably one
letter) names. This'll hopefully help cut down on both the wasm size slightly
and also the generated JS as the glue we're talking to wasm over won't require
such large names all the time.

crates/test-support/src/lib.rs

@@ -15,6 +15,7 @@ thread_local!(static IDX: usize = CNT.fetch_add(1, Ordering::SeqCst));
 pub struct Project {
     files: Vec<(String, String)>,
     debug: bool,
+    uglify: bool,
 }
 
 pub fn project() -> Project {
@@ -27,6 +28,7 @@ pub fn project() -> Project {
         .read_to_string(&mut lockfile).unwrap();
     Project {
         debug: true,
+        uglify: false,
         files: vec![
             ("Cargo.toml".to_string(), format!(r#"
                 [package]
@@ -125,6 +127,11 @@ impl Project {
         self
     }
 
+    pub fn uglify(&mut self, uglify: bool) -> &mut Project {
+        self.uglify = uglify;
+        self
+    }
+
     pub fn test(&mut self) {
         let root = root();
         drop(fs::remove_dir_all(&root));
@@ -159,6 +166,7 @@ impl Project {
             .input_path(&out)
             .nodejs(true)
             .debug(self.debug)
+            .uglify_wasm_names(self.uglify)
             .generate()
             .expect("failed to run bindgen");
         obj.write_ts_to(root.join("out.ts")).expect("failed to write ts");