Adds a "Content Type Browser" to the server

[bracken]

Adds a page to browse installed libraries, depends on the API refactor PR
See attached video for functionality.

I need something like this for myself to more easily understand Libraries when working on them and I thought others would benefit as well if interested.

This PR adds:

• src/server/apis/typeBrowser.js - new API endpoints for the Type Browser UI
  • This mostly reuses helpers from logic.js
• assets/type_browser/* - Two pages for the browser index and viewing an individual library
• assets/type_browser/components - The components used in the browser
  • The bulk of the lines in the PR are these components, they are fairly well composed viewers for each part of a Library

content.type.browser_.mp4

The components all work together and the index ends up with a structure like:

<h5pcli-type-browser src="/type_browser/installed_libraries">
    <h5pcli-content-type collapsed>
        <h5pcli-library-overview></h5pcli-library-overview>
        <h5pcli-semantics src="/libraries/H5P.TrueFalse-1.8/semantics.json"></h5pcli-semantics>
        <h5pcli-xapi-examples src="/type_browser/H5P.TrueFalse-1.8/xapi_examples">
            <h5pcli-xapi-viewer slot="viewer"></h5pcli-xapi-viewer>
        </h5pcli-xapi-examples>
    </h5pcli-content-type>
    <!--  repeated for each content type  -->
</h5pcli-type-browser>