Upgrade webpack to v4 and babel to v7

Upgrade webpack and Babel.

This results in dramatically smaller bundles:

Before:

                               Asset     Size  Chunks                    Chunk Names
d136727b42a9d217c2c9b77f26023f92.png   437 kB          [emitted]  [big]
           0.d669d74d2b380c453c4b.js   906 kB       0  [emitted]  [big]  IntlBundle
         app.d669d74d2b380c453c4b.js  11.3 MB       1  [emitted]  [big]  app
      vendor.d669d74d2b380c453c4b.js  11.7 MB       2  [emitted]  [big]  vendor
        app-7f623d524f2f5202d15d.css   324 kB       1  [emitted]  [big]  app

After:

                               Asset      Size  Chunks                                Chunk Names
           2.36ecc82c5d9883af7111.js   224 KiB       2  [emitted] [immutable]         vendors~IntlBundle
624d8a6b5ffb5fca686e7236c7e03595.png   426 KiB          [emitted] [immutable]  [big]
         app.36ecc82c5d9883af7111.js   3.5 MiB       0  [emitted] [immutable]  [big]  app
                             app.css   235 KiB       0  [emitted]                     app
      vendor.36ecc82c5d9883af7111.js  1.53 MiB       1  [emitted] [immutable]  [big]  vendor

This should be tested thoroughly of course... it seems various flows behave slightly differently. I believe I have a working local run of the docker script though.

added 1 commit

• 3a3cce84 - remove steemjs

Compare with previous version

merged

mentioned in commit fea34ff5

mentioned in commit wallet@4a0a7071

mentioned in merge request wallet!77 (merged)