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This finally allows us to remove the dependency on Enzyme.

Also as part of this PR:

- Removed components
  - LaunchbarContainer (serves no purpose)
  - Account (not used)
  - SpeciesTab (superseded by SelectedSpecies component; not used anywhere)
- Removed tests for Launchbar
- Removed the launchbarExpanded and accountExpanded fields from redux and from components
- Changed the keyCode field on KeyboardEvent to event.key
   (typescript marks it as deprecated, whereas Browser support seems to be good these days).

Add licence header to all typescript files in the src and stories directories

Also:
- fix tooltip positioning bug related to window scrolling
- add useRefWithRerender custom hook that makes sure
  that component updates after ref.current has been set
  (useful when rendering of component's children depends on
  existence of refs to other DOM elements).