LPS Restructuring Con't: New Tools Component

[RayPlante]

This PR is part of an ongoing effort at restructuring the angular Landing Page Service (LPS) app in an effort to improve maintainability and ease further evolution of the presentation. Its overall goal is to distribute the current LandingComponent into several smaller apps that are aggregated together. This PR, in particular, breaks out the right-hand tools menu into is own component, leaving the LandingComponent to handle just the main body of the landing page content. While implementation of the menu is largely unchanged, it is a helpful precursor to replacing the tool bar with an implementation that is primeng-free (as the primeng components don't work with the server-side rendering).

The change provided by the PR is summarized in the following diagrams.

In particular, the changes include:

• a new tools module (ToolsModule) containing a new ToolMenuComponent that encapsulates the current right-hand menu (also used as the pop-up menu while in mobile mode).
• re-org of citation component, including
  • placing it in its own CitationModule
  • splitting the layout into CitationDescriptionComponent, which handles the pop-up content, and CitationPopupComponent, which presents the content into a pop-up window.
• the tool menu and citation component are now part of the LandingPageComponent composition, and removed from LandingComponent. The latter now just handles the body content of the landing page.
• added the NERDMResource class to app/nerdm/nerdm.ts which handles more metadata transformations, including generating citation text.

(As a preview, the next restructuring PR will split the LandingComponent into the different navigable sections.)

To review, please:

1. review this PR description
2. scan the code differences as needed for any obvious issues
3. run standalone with editing turned on and off to ensure proper layout
4. run under oar-docker/apps to ensure proper integrated behavior

[RayPlante]

Sorry, I accidentally created this PR from a personal branch (RayPlante) rather than from usnistgov. I've pushed this same branch to usnistgov for your convenience.