New web UI components

[EitanBlumin]

List here:
https://blog.bitsrc.io/9-web-component-ui-libraries-you-should-know-in-2019-9d4476c3f103

Need to review and see if there's anything good that could be a good fit for this project.

[EitanBlumin]

These look like useful Polymer components for rendering Markdown documents:

https://github.com/vanillawc/wc-markdown

https://github.com/zerodevx/zero-md

Polymer components for datatables: https://www.webcomponents.org/search/datatable

https://github.com/bluewatertracks/bwt-datatable

https://github.com/RoXuS/paper-datatable-api

https://github.com/vaadin/vaadin-grid

https://github.com/rom1504/wct-datatables-net