BridgeJS: Namespaced elements in Exports

[krodak]

Introduction

First part of improvements to address #451 and discussions from: #448 (comment)

Overview

• Namespacing structure is properly reflected in Exports
• Access to namespaced static properties is finally available via Exports
• Static properties implementation is improved; Object.defineProperty now only global this only references export's implementation

Testing

Some additional tests to check extended exports access

Next steps

Next PR will include:

• optional namespace global
• { "exposeToGlobal": true } in bridge-js.config.json

[kateinoigakukun]

The generated code is well aligned with my expectations, thanks!