Replace the current resource-server-webapp with a version based on Spring Boot and add support for webjars

[drewwills]

fixes #82

With this change, you'll be able to add webjars to uPortal-start with a dependency like this one...

runtime 'org.webjars.npm:uportal__content-carousel:1.6.0@jar'

and publish web components-based content with HTML like this example...

  <script src="https://unpkg.com/vue@2.5.16"></script>
  <script type="text/javascript" src="/ResourceServingWebapp/webjars/uportal__content-carousel/1.6.0/dist/content-carousel.js"></script>
  <content-carousel
          type="portlet"
          source="/uPortal/api/v4-3/dlm/portletRegistry.json"
          slick-options="{slidesToShow: 6, infinite: true, arrows: true, dots: true}">
  </content-carousel>

[ChristianMurphy]

Is this something that can be backported to 1.0.x? It seems like a breaking change.

[drewwills]

Is this something that can be backported to 1.0.x? It seems like a breaking change.

It's not a "breaking change," in the sense that the new code has all the same behaviors as the old code, and you can use it in place of the old release without any configuration adjustments, etc.

But it is an unusual change to include in a patch release, because...

• It completely guts & replaces an existing module
• It includes (significant!) new capabilities

You know what the issue is: uPortal cannot run without a copy of ResourceServingWebapp 1.0.x.

We can either backport these enhancements (merge this PR), or bundle two copies in uPortal-start -- one old, one new.

Let's attempt the latter approach first. (We can hold off on this PR, but we need to merge the other one.)

[drewwills]

Didn't this update get merged (and released) ages ago?

[ChristianMurphy]

It is released on master, it has not been backported to v1 yet.