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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  - SpeciesTab (superseded by SelectedSpecies component; not used anywhere)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).

Update the AppBar species lozenge with the new design.

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

- Use the real api endpoint to get search-related data
- Update typings of search-related data
- Show message when no matches were found
- Add an interface element for clearing the search field
- Show a link to Genome Browser when at least one species has been selected
- Update the way that the data about selected assembly is passed in redux action
- Rename CloseButton to ClearButton (better reflects its functionality)
- Show tooltip when hovering over popular species buttons
- Show tooltip when hovering over the hint button (right-hand corner of species search field)
- Remove the remaining SpeciesSelector stories (they don't serve any real purpose anymore)
- Fix tests
- Remove unused mock data for species selector

- Add a working screen for Species Selector (instead of the placeholder)
- Implement the workflow of searching for a species in the search box,
   selecting species‘ genome assembly, and adding the search result
   to the list of selected species
- Show list of selected species in the header bar of Species Selector
- Enable, disable and remove selected species

JIRA tasks:
- https://www.ebi.ac.uk/panda/jira/browse/ENSWBSITES-66
- https://www.ebi.ac.uk/panda/jira/browse/ENSWBSITES-69