Put images in loading/init screen

This commit adds support for adding dimensions to existing
fields. Values and human readable values (optional) can also be
added/updated.

This commit adds storage of dimension data that the user provides for
an existing field. This is to translate enum-like
fields (i.e. integers) to a textual description of that data. This
remapped value will be included in the response with the original
value. The UI will then take that and show the more user friendly
remapped value.

The new "remapped_from" and "remapped_to" attributes in the cols field
of the response will indicate that a field replaces another field.

* add image files and get new text in there

* modal content + refactor

* update illustrations and remove redundant one

* add tests

* add images

* button text tweaks

* padding

https://github.com/metabase/metabase/issues/3715
Liquibase has been rechecking the jar signature for each migration
file, resulting in slow startup times.

* QB modes, actions, and drill throughs.

* Refactor drill throughs + misc bug fixes

* Port sort action to drills

* Smarter 'view this/these' name

* Scalar hover state

* QB actions: don't skip action selection screen unless the action is marked as 'default'

* Fix flow errors

* Fix drills

* Show "This X's Ys" for FKs

* Prevent qb from uneccesary push states

* Don't show (fk) breakout fields that have already been broken out

* Fix 'drill into this' unit

* Cleanup timeseries footer

* Cleanup qb selectors

* Namespace all qb actions

* Make modes dependent on previously run card

* More timeseries footer cleanup

* Fix table crash

* Make breakout legend clickable

* Fix datagrid pivot test

* Flow + lint