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Proper cross-fade animations.

Fix slow slowing-down of genome browser over time due to leak.

* Basic bumped scaling for margin-free regions.

* Correct for potentially lop-sided borders.

* Tweak padding pixels for small screens.

Ideally we need to find out why any padding pixels at all are needed.
But this works down to 1100px at least for now. I'll JIRA the rest.

* Update packages.

* ENSWBSITES-89 fix.

* New WASM.

* Import genome browser static files from a github repository
* Send deployed assets to assets repo.
* Delete module cache to force npm to take a look.
* Pruning script
* Confirmation for push
* QA.
* Update package-lock.json
* Switch to using tarballs.

to fix the problems introduced in PR #196

- typescript 3.7
- react 16.11
- remove @types/storybook__addon-actions
  (@storybook/addon-actions now ships with its own types)

* update dependencies

* updated dev dependencies

Specifically, bump react and react-dom versions to 16.9, which removes warnings
about wrapping code that changes state inside of `act` from our tests.

- /api/ensembl_object namespace has changed to /api/object
- /api/object/info parses region location and generates data for region focus object
- ensembl_object_id field in the response has been renamed to object_id
- /api/genome_search endpoint now accepts the exclude parameter
   (to exclude already selected genome id from search results)
    and the limit parameter (to limit the number of search matches in the response)
- show gene coordinates in BrowserBar
- extract formatter of genetic location into its own functino

Update packages. 
- lint-staged to solve the git-related issue
- css-loader (a major update with a breaking change that required updating webpack configs)
- react-redux (now supports hooks)
(and the rest, uneventfully)

- Update packages, run npm audit fix
- Update webpack prod config
   (output all images into dist/images, without prepending path)

- 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