Move @parity/resolc from js-revive (#296)

- Move npm package from paritytech/js-revive 
- Rename package to `@parity/resolc`

js/emscripten/examples/web/worker.js

@@ -0,0 +1,14 @@
+importScripts("./resolc_web.js");
+
+// Handle messages from the main thread
+onmessage = async function (e) {
+  const m = createRevive();
+
+  // Set input data for stdin
+  m.writeToStdin(e.data);
+
+  // Compile the Solidity source code
+  m.callMain(["--standard-json"]);
+
+  postMessage({ output: m.readFromStdout() || m.readFromStderr() });
+};