Refactor OfficeHelpers core files and build processes

[WrathOfZombies]

The following pull request refactors the core files for authentication, dictionary & storage to make it simple. Notable changes are

• IE & Edge have a very different dialog flow that uses localStorage based change detection to determine when to close the dialog.
• Dictionary now uses a Map as a backing datastructure
• Storage now creates multiple keys instead of constantly writing them to a single array.
• Build process has been updated to using webpack to reduce bundle sizes and utilize efficient tree shaking
• Added base test configuration to start writing unit tests