Create dataset info drawer (#1805)

* create infoDrawer

* create read/writes to redux store

* reimplement reducer that vanished

* remove aboutURL stuff from title

* add formatting and style

* s/length/size and make metadata items list items

* remove comment

* remove empty singletons

* refactor into async react component

* Clean up skeleton

* swap out for loop for map

* add comment

* replace placeholder

* switch ternary for `&&`

* event handling fixes and PR feedback

* add button and move click handler to button

* ditch empty categories

* move drawer button handling to redux

* remove categorical move note

* PR feedback from colin

* update snapshot

* remove hover state

client/src/components/menubar/index.js

@@ -250,10 +250,7 @@ class MenuBar extends React.PureComponent {
       >
         <AuthButtons auth={auth} userinfo={userinfo} />
         <InformationMenu
-          libraryVersions={libraryVersions}
-          aboutLink={aboutLink}
-          tosURL={tosURL}
-          privacyURL={privacyURL}
+          {...{ libraryVersions, aboutLink, tosURL, privacyURL, dispatch }}
         />
         <UndoRedoReset
           dispatch={dispatch}