Turbo Render (#298)

* More responsive React updates on scroll

* `Icon`s now use shadow dom

* Faster Sparkline

* Recycle table rows

* Separate Header from Chain to avoid vdom diffing

* Separate THead from Row.HEADER to avoid vdom diffing

* Throttle rendering updates on chain tabs, also styles

* Minor tweaks and fixes

* Created components for all columns

* Wrapping up Column refactor

* Rename Row--td to Column

* Lazy `Ago`

* Update styles for faster layouting

* Minor cleanup

* Fix Connection

* Use shadow DOM in `PolkadotIcon`

* Comments and tweaks for the List component

* Faster Tooltip and Truncate

* Minor tweaks

* Tooltiped columns can now be copied

* Future-proof Connection

* Remove the <div> wrapper from Icon

* Fix dash on missing graph data

* Clean up some SVGs

* Cleanup and comments

* Localize the use of `previousKeys` to `recalculateKeys`

* Custom appState disjoint from React component state

* Make appState and appUpdate refs readonly

* Cleanup

frontend/src/App.css

@@ -2,6 +2,7 @@
   text-align: left;
   font-family: Roboto, Helvetica, Arial, sans-serif;
   font-size: 16px;
+  min-width: 1318px;
 }
 
 .App-no-telemetry {