Implement basic sale creation form

[rossneilson]

The initial plan was for an extensive dashboard with analytics, swapr integration etc.
However with the cut down scope of a v1 Aqua release this was reduced to just the core functionality that would allow for easy sale creation by anyone in the UI.

For the inital version of the dashboard this should be a simple form that uses aqua-js library to launch sales. The only work needed on the frontend should be making a nice UI similar to the mockup that collects the necessary data to launch a fixed price or fair sale.
No additional backend changes should be needed and examples of launching sales exist in the scripts in aqua-js/examples.

Designs for this were created by me and Geronimo below: