handle many modes of new project creation

* Make loader blocks mirrored on RTL

* Whoops, forgot to change names

* Fix problems with flipping back

Resolves #3336: Prevent multiple peripheral alerts after language switch

responding to canSave without needing canSaveNew prop
removed canSaveNew
added default for onUpdateProjectId
removed conflict files erroneously added
don't pass down onError
got tests passing
better creating and saving logic and names

Get costume url bugfix

Update scratch-vm to the latest version 

Add video translation

Preload fonts

Update scratch-vm to the latest version 

Update scratch-storage to the latest version 

sb-file-uploader gets title of any sb.* file; calls onUpdateProjectTitle

Update vm

Update chromedriver to the latest version 

don't set redux project title directly from sb uploader; only extract title from .sb2 and .sb3 filenames

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.