Integrate ORML-tokens and wrap native token into webbNATIVE (such as webbEDG).

[drewstone]

We want to support multiple assets and make it easy to extend to future assets. One way we can do this is by first wrapping all assets into webbX versions. This way, all assets going in and out of the system are effectively wrapped.

The module itself can take care of wrapping and lock up the EDG until someone unwraps the webb variant.