Update scratch-vm to the latest version 

Add sprite/stage watermark to the blocks workspace.

Update babel-loader to version 8.0.4

Also include babel-core bridge for Jest itself, which depends on Babel 6.

Required by update to babel-loader

Also requires updating babel-preset-react and babel-preset-env to @babel/preset-react and @babel/preset-env

Closes #3019

chore(package): update babel-eslint to version 10.0.1

project state reducer tests, bug fixes

chore(package): update scratch-vm to version 0.2.0-prerelease.2018101…

* Add 14 music loops

* Rename sounds Connect and Disconnect to Start and Finish

* Fix name of Odesong

* Update names

use can__ boolean properties to explicitly set user capabilities

Cached url should be shared across watermark and sprite-selector-item for performance, address other review feedback.

Closes #3376

Update chromedriver to the latest version 

Migrate Videos from YouTube

* Adjust language icon and caret in menu-bar
* remove unused style from `language-selector.css`

Add project loading HOC tests

disable onShare button