* Start adopting Yarn workspaces
My plan is to move the existing package into a workspace and then split
out the things that really ought to be their own packages. For example,
the demo site and the experiments really ought to be separate.
Fix lint command
* Use workspaces in CI
* Fix deploy for monorepo
* Upgrade Typescript
* Upgrade prettier
* Upgrade eslint-typescript
* Don't abide extra else
* Remove eslint plugin that we don't use any more
* Remove unused Webpack plugin
* Remove eslint rule that we don't really need
* Remove unused Jest plugin
* Remove redundant package
* Prettier fixes
* Make modern part of the code base
`yarn modern` will now start a dev server with the modern app running.
The debugger is not yet setup
`yarn test` will run all the tests, both Webamp and "modern".
* Let debug work
* Prettier
* Ignore lint errors for now
* Point test at the now skin location
The following additional plugins were being used because of our use of
the older version of Uglify:
```
Using plugins:
check-es2015-constants {"uglify":true}
transform-es2015-arrow-functions {"uglify":true}
transform-es2015-block-scoped-functions {"uglify":true}
transform-es2015-block-scoping {"uglify":true}
transform-es2015-classes {"uglify":true}
transform-es2015-computed-properties {"uglify":true}
transform-es2015-duplicate-keys {"uglify":true}
transform-es2015-for-of {"uglify":true}
transform-es2015-literals {"uglify":true}
transform-es2015-object-super {"uglify":true}
transform-es2015-parameters {"uglify":true}
transform-es2015-shorthand-properties {"uglify":true}
transform-es2015-spread {"uglify":true}
transform-es2015-sticky-regex {"uglify":true}
transform-es2015-template-literals {"uglify":true}
transform-es2015-typeof-symbol {"uglify":true}
transform-es2015-unicode-regex {"uglify":true}
transform-regenerator {"uglify":true}
transform-exponentiation-operator {"uglify":true}
transform-async-to-generator {"uglify":true}
syntax-trailing-function-commas {"uglify":true}
```
