Point of Sale Refactoring

[dennisreimann]

As described in #749 and talked about with @Kukks.

This is mostly UI related as it separates the simple static and cart views.
Replaces the EnableShoppingCart setting with a DefaultView, which can be set to Static or Cart.

Also gives the ability to define the view type via an optional URL parameter [Route("/apps/{appId}/pos/{viewType?}")], falling back to the default view defined in the settings.

These are the things I'd appreciate input on:

• How to ensure we are backwards compatible for apps that had EnableShoppingCart set?
• Is there a better way to solve this? Html.GetEnumSelectList<PosViewType>().Where(type => Convert.ToInt32(type.Value) >= 0)

Closes #749.

[dennisreimann]

The test failure seems unrelated, can someone retrigger the selenium tests?

OpenQA.Selenium.WebDriverException : Cannot start the driver service on http://localhost:45594/

[Kukks]

Happy this is finally happening, we can clean up the POs this way.

• I'm not sure if unspecified should be an option
• We need to leave EnableShoppingCart for backwards compat so that existing apps dont lose their default view ( users should not be effected when upgrading to the next version)
• We should migrate the data from EnableShoppingCart to ViewType, when updating. In the customer-facing action methods, we should just do settings.DefaultView = settings.EnableShoppingCart? PosViewType.Cart : settings.DefaultView;
• We should make the actions load the view type partials directly (i think but not sure)

[NicolasDorier]

Build fail

[NicolasDorier]

@pavlenex you want to manually test?

[pavlenex]

tACK. I tested a bit and haven't found any problems.

A note though, do we really want a drop down for enabling cart? It's okay but we'd have to alter documentation as well.